Findlay's son Toby then shone with the ball in the second innings, ending up with four wickets for 27 runs.
Marist lost wickets early and often before being bowled out for 91 runs in the 34th over.
Meanwhile, in Ongaonga, repeat overall 50-over champions Central Hawke's Bay bowled Havelock North out for 125 in 42 overs.
Havelock's third wicket partnership between Dion Joll (34) and James McGruer (48) was the best spell of a difficult innings for the visitors.
Their wickets were both claimed by Toby Richardson, who finished with four wickets for 23 runs conceded.
His Central side reached the target in the 41st over for the loss of eight wickets.
Dominic Thompson (62no off 95 balls) hit the winning run having arrived at the crease in the 13th over to carry them to victory.
At McLean Park in Napier, Thompson's Hawke's Bay representative teammate Jayden Lennox has been captaining the New Zealand XI against The Netherlands men's side.
In 50-over matches the NZ XI followed up on a rain-shortened victory on Thursday with a four wicket win on Saturday, chasing down the Netherlands' total of 215 with more than seven overs to spare.
The teams will play a Twenty20 game on Monday in Napier; the final warm-up match before the Twenty20 international between The Netherlands and the Black Caps at McLean Park on Friday.