180 t stat is no help especially with the stock fan settings.

i got my fans tuned to 180 and still run a 195 t stat, i run 195- 210 ish but it holds there, that traffic hot.

rad cleaning, spray it and the a/c condenser core with de greaser, then hose it out form the fan side out. if its clogged up with dirt and leaves and bugs you'l see the crap coming out.