I wouldn't rule out the water pump Les...you seem to be fine on all the other driving. Extra fan would help some. What type of grille do you have, or do you take it off to run...the stock grille is restrictive if you don't cut the tabs off the fins so air can flow straight to the radiator. I have just done a separation kit, and really haven't had problems with cooling, although lowering the temps is beneficial. Now, I am not ***** to the wall like you, although at the Dragon, I gave the car a good workout, and my temps stayed near the line...temps were 30 degress cooler than you though...lol.... water pumps can get tired before they finally fail, belt slippage can add to this as well...good luck either way, car looks fantastic btw...