225 running a bit warm!!!
I'm not sure what you mean by a "solid steel race fan" but most low resistant fans don't pull enough air. Your problem, however, seems to be water flow.....not air flow. If you can, post a photo of it so we can start another debate! You might try putting your flex fan on it just for diagnostic purposes. If it cures the problem, get a new fan similar in size but with solid blades, not a flex fan....those things can grenade on you. On a different subject.....are you related to a Craig Stimac that used to play pro baseball?