Reads? Whats this guy's image? What is his calling range.

9-9 is a hand you can put him on, as well as KQ, AQ and so fourth. Check raising as a continuation bet often screams monste, especially when a lot of people continuation bet if they miss or hit (but not as strong)... and if this guy is calling your check-raise, you need to slow down. If he's tight then you have to realize his calling range and realize you are probably behind

but at the same time, as this level, its hard to get away from it. I sit waiting to hit a J or a Q, but otherwise slow down and maybe check/call river (if all the money isn't there already)