When you c/c as the PFR on J98 rainbow, you just need to make sure the hands you put in that range are benefiting the range.

For example, most people have some kind of pair + ten nearly every time they check call this flop. This covers their range on 7/Q rivers, but otherwise IP can just triple on every other runout. So you need to cover when the board completely blanks off by also check calling with AJ/J8/98/QQ. These are pretty strong hands that don't want to get all in but can comfortably call down for three streets on blanks.

Calling with hands like 87 spades and 96 clubs helps you to cover spade and club runouts, but are probably pretty bad check calls if not part of a balanced range as outlined above.



Anyway, I like your line, thats just a subject I've been thinking about a lot lately so I thought I'd give my thoughts.