It was 1-0 at the break, but only 2 minutes after the restart, Obeng doubled the home side`s lead, only for former Lamb, Kyle Perry, who came off the bench in the first half, pulled Stratford back into the game 2 minutes later.
But on the hour-mark, Bilal Yafai was brought down in the box and Ryan Beswick converted the resulting penalty for his 20th goal of the season to date.
And the icing on the cake was added in stoppage time when new loan signing Joel Carta, on as a sub, made it 4-1.