Transmission cooler help

I'm running a 360 w/a 26" 3 core rad, dual 12" electric fans, and a trans cooler about 3 inches in front of the rad. It never needs the fans unless I stop running a 160 thermostat. The fans come on at 180 and turn off around 190. No problems with this set up at all and I'm driving in 100+ temps. The rad fluid doesn't go through the 26" rad, but my trans cooler is about 24" wide 1' tall and over 1" deep.

I wonder if your rad is not big enough, not clean enough, or if you don't have a shroud on it. Just wondering. That is the only reasons I can see why it wouldn't cool, but then again it is entirely possible that the rad is too close, that and if it is on the rad, it probably most likely would damage it eventually.