Your best dyno numbers were with 72 jets in the front and 81 jets in the rear ???? You wrote 81\72....I assume you ment 72's in the front primary.
A stock fan is the best for cooling but takes a little power from the engine.
Check the plugs just to make sure it isn't lean.
I bet the electric fans are most of the problem.
Make sure your gauge is right by using a infrared thermometer.
Harbor Freight sells them and they are really useful.