ditch that 160 t stat for starters, put the 195 back in, even if your modded. the car wants to run at 210. thats why even with a 160 it gets to 210 still. unless your fans have been tuned to come on sooner theres no benefit, if you do all the tuning and crap for the fans, theres still no benefit. the engine runs its best at 210 deg's.

unplug the temp sensor the fans should come on. we've seen guys buy brand new temp sensors and they fail right out of the box. 2 and 3 in a row too. its pretty sad really. parts wise.