over heating

Spazz said
16 inch on the outside (electric pusher, not so good) no shroud. Hoping to change all this to dual fans with shroud inside soon

That's your problem.

A thermostat change won't do any good. You are running 220. At 220 every thermostat out there will be open, if it's not, it's bad.

The #1 problem with cooling systems is that people building bad cooling systems.