Well for my last race at Watkins glen I used same setup for practice(quali) and for race. Only fuel was difference. usualy i do have two diffrent setups cos of more pressure in tires or some balance or ramp angles. but in WG i use same. incredible.
I am now surprised how did you drive all this time. if You dont know how to set car. Cos for me gpl is imposible to drive if setup is bad.