@swbca, I have a 2002 Prostar 190, purchased in '05. I agree with all previous statements about getting the weight out. Empty the trunk, remove rear seat. If I recall, the 197 weighed about 200LB more than the 190. Due to the front seating?
The prior owner had the hook added to gel coat by local dealer, and the wings cut off the rudder. I skied behind a friend's 2001 PS190 on my lake without the hull hook, but with the winged rudder. Noticeably softer wake at 32 IMO. So, I installed the winged rudder and it did improve the wake. You may want to try the winger rudder. I did see one ski-it-again. Easy to install without any modifications. BTW, I add 100LB on left side in the bow for balance.