Vauxhall led by a Robbie Lawton goal at half-time and eased to victory with second half strikes from Cuminskey, Young and Lynch.
The battle to avoid the unfilled relegation spot will go to the final day of the season with Winsford now cast in the role of favourites.
Their loss of six points for fielding ineligible players may prove to be decisive in the final analysis.
In the game against Belper at the Barton Stadium they fell behind to a Sean Gummer goal after 34 minutes.
Winsford then hit back to level the scores two minutes later courtesy of a Danny Worthington effort before finally succumbing to Carl Cunningham’s 72nd minute winner.
Gretna edged out of the relegation places following their win over Kendal Town. Mark Dobie’s 29th goal of the campaign proved to be the only goal of the game.
