Biggest issue with the Perk and that section of the Wissy too is the loss of spawning habitat from siltation. It was not always that way. My brother rented a place on the Perk down the road from Ursinus in the 90s and we caught many bass with little effort all the way down to Zieglersville and beyond. That house he lived in washed away long ago or was deemed in a flood plain.
As far as Wissy in Montgo, now you can pick 4 or 5 spots in a 2 mile stretch that might have smallies holding on: rocks and clean rubble. I even see a few spawning in better conditions in Ambler, but then it gets muddy above there again and full of stuff from Upper Gwynedd lawns. Sadly, it is no coincidence that the term "spring" is included in so many place names on the Wissy watershed in Montgo, but folks have lived here as long as they have in Philly proper. My town was purchased from Bill Penn....
It is counterintuitive, maybe, but the bug life, forage like minnows and crayfish, and presence of plenty of smallmouth is much higher in Philadelphia. And it is much more beautiful a place. You college boys might meet a lovely jogger who likes dudes in waders too.
Wissy in Montgo is a storm drain....