There was a brief comeback as Nav Singh (35) took the attack to Gerard Hobbs for an expensive three overs, but Hobbs caught up with him for Stephen Holloway to get the stumping.
All seven United bowlers shared the wickets, with spinner Robbie Power again introduced at the key stage to get 3-26 from his four overs.
As expected, United captain Tom Lance set himself to bat at least most of the innings, and carried his team with an unbeaten 83 from 102 balls - being willing to wait out the good deliveries and then punish anything loose to the tune of 14 boundaries.
For example, with opening partner Allistar Bostock being very watchful for 36 deliveries, it seemed like bowlers Huka Kahu and Caleb O'Connell were getting on top of them, until Lance would launch into consecutive fours off both to keep the run rate ticking over.
Greg Smith (31 from 33) joined him to lift the tempo and nearly have United home and hosed at 105-2, before Simonsen (2-30) introduced a couple of speed wobbles by getting Smith and Brendon Walker in quick fashion, while Hobbs was trapped in front by Dave O'Brien (1-42).
However, Power steadied the ship with 19 from 20 balls, before Holloway joined Lance to sign off on the five wicket win with plenty of overs left to keep them on top of the table by a point over Paraparaumu.
On a hostile pitch at Donnelly Park, Tech had virtually decided the matter for the final qualifier when they decimated Levin for 106 off 37 overs.
Trying to survive the formidable opening combination of Ross Kinnerley (1-12) and Nick Harding (1-24), Levin had a mini recovery from 10-2 to 44-2 through Keegan MacLachlan (22) and probably thought they could now kick on against the lesser bowlers.
Enter Akash Gill, who in a devastating nine over spell picked up 6-25, as he and Caleb Greene (2-26) tore through the rest of the order, with only Stacey Kerehoma (21) able to offer some resistance until Gill had his stumps - one of his three clean bowled dismissals.
Manager Andy Lock said fast deliveries could take out the ankles and were a fearsome prospect.
"The pitch was not favouring batsmen, there were cracks all over it."
In reply, Tech could not feel over-confident when Bevan Hunter was bowled first ball by Daemon Kennett, but after the top three batsmen soldiered through the first 6-7 overs, Gill (30) joined captain Dominic Lock (50 not out) to work the ball around and then get to some bigger shots as the target crept closer.
Kinnerley joined Lock to smash the last ball for six after only 19 overs to secure a bonus point and lift Tech above both Levin and Weraroa for a satisfying third place finish.
Marton were left wondering what might have been at Kena Kena as they had Paraparaumu under the pump at 119-6 in the 29th over, only for Ramesh Subasinghe (90 from 94) to lead his tail through to a demoralising 253 before being dismissed in the final over.
Andre Halbert (62) tried to carry the top order, but had lacked for support with Oliver Gordon (4-45) getting amongst them while Bryant Galpin (1-17 from ten) and Dominic Rayner (1-41 from eight) had been very conservative.
But Subasinghe dug in with Sean Windle (35) for an 89 run partnership in quick time, including a couple of big overs off Andre Canderle, and while Dan Ford (2-57) broke the partnership and then Josh Trillo (2-48) got the last two wickets in consecutive balls, the damage was done.
Marton began their run chase in earnest, with Jason Harris (63 off 119) trying to anchor the side, with his best support coming from Rayner (20).
But the key middle order of Craig Clare, Ford and Gordon could not get going as every other Marton batsmen was dismissed in single figures, so when Harris fell at 113-7, the writing was on the wall.
Marton completed a strange round robin where they defeated every Whanganui team, including table-topping United, but lost all four Horowhenua-Kapiti matches.
Marist have not enjoyed their campaign but had a lot of fun watching Chris Stewart bat for them against Kapiti, after he got down to a knee to launch seven sixes into the long trees at Victoria Park with a slashing 123 not out off 88 balls.
After Alex Goodin (48) and Zak O'Keeffe (23) did some good work at the top of the order, someone still had to stick with Mark Fraser (41) or the good run rate at 144-4 would not be capitalised as wickets were falling.
Stewart took over and hammered Kapiti to all corners, with bowlers Hayden Wright, Jayden Smith and Alex McDonald punished off their handful of overs.
Batsman Martin Harrison was Kapiti's leading hope and after three quick boundaries in the opening over, he played O'Keeffe's last ball onto his stumps and Kapiti could have packed up then and there.
Kahlil Craig (25) and Russell Pine (42) tried to at least survive through to the end, but Marist tipped over everyone else in single figures - giving eight bowlers a trot at the crease with the best being O'Keeffe (2-35), Michael Engelbrecht (2-16) and John McIlraith (2-13).
Scoreboards
Weraroa 157 (N Singh 35, A Simonsen 22, R Power 3-26, T Lance 2-14, B Toyne 2-31) lost to United 160-5 (T Lance 83no, G Smith 31, A Simonsen 2-30) by five wickets.
Levin 106 (K MacLachlan 22, S Kerehoma 21, A Gill 6-25, C Greene 2-26) lost to Tech 112-4 (D Lock 50no, A Gill 30) by six wickets.
Paraparaumu 253 (R Subasinghe 90, A Halbert 62, S Windle 35, O Gordon 4-35, J Trillo 2-48, D Ford 2-57) beat Marton 130 (J Harris 63, D Rayner 20, C Emmott 3-31, R Subasinghe 2-12, J Bohmer 2-20) by 123 runs.
Marist 345-7 (C Stewart 123no, A Goodin 48, M Fraser 41, Z O'Keeffe 23, K Craig 1-37) beat Kapiti 144 (R Pine 42, K Craig 25, J McIlraith 2-13, M Engelbrecht 2-16, Z O'Keeffe 2-35) by 201 runs.