[TheProdigy]

19/7 isn't just a nit who doesn't randomly squeeze anything. He might not play well in LP and doesn't steal much, leading to a low PFR.

a player like sabr who plays 20/17 is very easily squeezed by a 19/7 player(he is not 12/7 and that is a huge difference).

If he gave us some 3betting percentages, or blind steals, or looked at aggression factor postflop, or went to showdown percentage, I could give you a better idea of what to do, but since he doesnt I am going to assume a lot of times he could be getting played back at by even a 19/7