Boston United were undone by three goals after the break as the Magpies left Lincolnshire with maximum spoils.
It completed a tough week for the Pilgrims, following their 4-0 defeat at home to Solihull Moors on Wednesday.
Boston (3-4-2-1): Jake Lovelace; Taylor Redman, Owen Sheriff, Taylor Jaine; JJ Ward, Han Stevens, Jake Henderson (Jake Higginbottom 65), Josh Doran (Lucas Stubbs 82); Krisztian Gagyi (Patrik Bad 73), Lucas Turrell; Flynn Slater. Subs (not used): Cameron Smith, Cameron Fox (gk).
Referee: Alistair Wilson.