I think you're calling for a split at best most of the time.

Micro players will lead out on the turn like this afraid that you'll check behind with an ace when they have the jack. Once you call I wouldn't expect them to fire the river with their bluffs every time as they have to assume you have Jx a decent amount as well.

Obv they do this with flush draws as well, which makes it more of a fold, but I'm folding on a blank as well as we're just bluff catching and 5NL players won't be bluffing often enough.

With the turn J and the river making the flush, they have a very small bluffing range on the river. Expecting to see a bunch of Jx hands on the river, I'd fold even for this size.

I think you played it fine till the river given the limit and BUvsBB spot, but I'd be folding the river on this texture. I just don't see villain doing this with enough bluff combos to justify the call.