Wyeast 3787 is a beast, absolutely use a blow-off. I had 5 gal in a 6.5 gal carboy that would’ve blown within 24 hrs if not for my blow-off. I used it in the Patersbier and it is very much a Belgian strain. Slightly tart and fruity fermented around 68F. Really good Belgian strain IMO.
How was the Patersbier? I’ve got this kit sitting on the shelf waiting. Planning on doing this one with the 3787, then using the cake for a tripel or a golden strong.