Joint manager Lee Canoville hailed Boston as worthy winners following their 3-1 victory over Lincolnshire rivals Gainsborough Trinity.
Jason Lee put them in front before former Pilgrim Shane Clarke levelled.
Ben Milnes restored the visitors' lead and Marc Newsham made it 3-1 from the penalty sport after a foul on Lee.
Canoville told BBC Lincolnshire: "We're delighted with the performance. We knew it would be hard work and in the end I think our quality shone through."
He added: "We scored three goals and we didn't sit back when we had the lead, we pushed on. We looked confident and that was the pleasing thing."
The Pilgrims took the lead through Lee's long-range effort on 18 minutes but Clarke, one of eight players in the match to have played for both clubs, equalised five minutes later after an error by Jordan Fairclough.
However, Trinity were level for only five minutes as another long-range strike from Milnes put Boston ahead again.
Gainsborough were reduced to 10 men for the final 15 minutes as goalkeeper Dimitar Evtimov was sent off for bringing down Lee.
With all three subs used, defender Gavin Cowan took over in goal as Newsham scored the resulting penalty.
Gainsborough boss Steve Housham felt the penalty decision should have gone the other way, but conceded that his side's errors had ultimately cost them.
"We worked hard but you can't coach the individual errors we made today," he said.
"I won't pinpoint any players but we should have done better with the goals - the two they scored and the one the ref gave them. It was a definite foul on my player.
"I've not had a go at the players because they've worked hard, but the quality wasn't there."
However, despite a third consecutive defeat Housham felt Trinity's promotion ambitions remained on course.
"We're just going through a sticky patch," he insisted. "The bubble hasn't burst, it's just got a hole in it and we'll do our best to repair it."