The Pilgrims were beaten 5-0 at the Lamb Ground, as the hosts ticked off a quickfire league double.
It followed Tamworth's 7-0 win at the Jakemans Community Stadium earlier in the month.
Boston: Alfie Harney, Archie Bradford, Alex Van-Tam, Reece Coy, Joel Smith (Jaydon Sargent 85), Elod Nadasdi, Charles Doble (Toby Foreman 46), Kye Rook (Harry Gunthorpe 85), Joe Todd, Kiaran Grove (Cody Elgie 66), Aron Ealham (Finley McDaid 69).
Referee: Rob Brown.