I have had 2 holes drilled in my 180 degree thermostat. because summer is kicking at 95 degrees I drilled 2 more holes in my thermostat for a total of 4 1/16 holes. Is this to much? I've noticed the car is about 10degrees cooler @ 55mph. It used to run right at 180 degree @ 55 mph now it'* no less then 170 degrees @ 55 mph

No, it won't hurt, but in the winter if the temps dip below 30* where you live you may want to switch back to a 195* t-stat.