Bar contact is bad so you probably need to shorten the links otherwise you will bend them... and something else along the way.
Hot tire pressure is always my goal so start with 32 cold and recheck immediately after each session. I want 36 hot on all four. You may want 38-40 hot for R-1 tires. Here is the tire guide:
http://www.bfgoodrichtires.com/assets/pdf/R1_Guide_online_2.26.07.pdf
Diagnosing handling issues is difficult enough trackside... So many variables. Much more so 2000 miles away and never seeing or driving the car. I will assume you had the car professionally corner balanced and aligned. I will also assume that your installer factored in a generous amount of rake. You say you "let up to make the final part of the turn, at that point I feel understeer". Is that right? You ease up on the throttle to make the apex and you get front end push? That doesn't sound right. When you lift the throttle the rear should become lighter and begin to rotate, and the front should stick. I am confused.