thermastat readings, help lower

heres what my stats read.
195 (used in the spring 70-85 degees) 185-210
195(summer 100+)200-215
180(in summer 100+) temp range 200- 220+
180 (in spring) 180-210
160(in summer) no good 220 +

i have heard of drilling two holes on a stat to help it breathe and ive heard of restricting the flow with a metered free flow stat.

the reason is every time my car hits 210 the car runs like a pos at the bottom. i think my feul is getting to hot but i'd for now just like to lower my running temp for the summer.

gonna try a 180 and wetter water this time any ideas other than. should i drill two breathers