The time points, along with best pen judging points, were crucial for Smith, while Fagan was unable to keep up the quality and ceded second place to Paewai who had the better combination of shearing board and pen points.
Last to finish, in 19min 55.54sec, and seeking the Mackenzie title for a fourth year in a row, Coster had the best combination of board and pen points of all and claimed fourth place.
Smith, travelling almost every weekend from his farm nearf Hastings, competed in 30 competitions during the season, winning 26, which, with two in the UK last July and 19 in New Zealand last season have taken him to 47 wins in the last 18 months.
It also took him to a career total of 113 dating back to his first Open-class win in January 2008 at Kaikohe, about 100km from where he grew-up around Ruawai in Northland.
His wins in the 2016-2017 season won him Shearing Sports New Zealand's Open Shearing No 1 ranking for the first time and the first-ever cleansweep of the Golden Shears and New Zealand Championships Open titles, the South and North Island Shearer of the Year titles, and New Zealand's two premier all-breeds events, the PGG Wrightson National Circuit final during the Golden Shears in Masterton, and the New Zealand Shears Circuit final during the New Zealand Championships in Te Kuiti.
The unbeaten run since the start of February also included the Southland All-Nations title, which he contested in Invercargill during the World Championships after missing a place in the championships when finishing only third in the national team trial in Christchurch in November.
Just nine days later he brought up a career century by winning the Counties Open final in Pukekohe, the day after winning the South Island Shearer of the Year and Southern Shears finals in Gore.
There will be little rest for Smith who is planning an attempt on a World Record of 605 strongwool ewes in an eight-hour day in England in July, while also on a New Zealand team tour of the UK with new World Champion John Kirkpatrick, also of Hawke's Bay.
Result:
Mackenzie Shears Open final (20 lambs): Rowland Smith (Hastings) 16min 52.34sec, 60.717pts, 1; Ringakaha Paewai (Gore) 18min 21.41sec, 64.6705pts, 2; Jack Fagan (Te Kuiti) 16min 43.62sec, 66.081pts, 3; Tony Coster (Rakaia) 19min 55.54sec, 68.577pts, 4; Eli Cummings (Pleasant Point) 19min 12.75sec, 69.6875pts, 5; Jason Ratima (Winton) 19min 33.78sec, 72.489pts, 6.