Stumped with cooling issues...please help

[Rick 91GT]

Well I have a Ron Davis Radiator, 180 thermo and a Stewart High Flow water pump, 16" Perma Cool fan, no A/C so the radiator see's all the air. 100% water with a rust inhibitor..

Crusing through town or low rpm my car gets hot 200+ degress once I get going down the road it cools down, so I know the radiator is fine, the flow in it is great. I was at the track and when I left the line my car was at 200 degrees, on the N20 I was trapping at 224 degrees.

I was told by Stewart that I can spin this pump either way since the design of their impeller is different that a stock piece. Well I tired that over the weekend with minimal changes, it runs a tad cooler. I have no heat in the car so the water goes through nothing but the motor and the radiator, should I go back to a 195 thermo like a stock piece. I thought I was having belt wrap issues due to this March tensioner set-up, but now I have almost 4" of wrap and it still doesn't run nice and cool like it should.

Any ideas?