Jim;

I would say your last work (WaPu exchange) has brought the issue under control...those pictures of Temp gauge are what I would expect for Arizona...if you add a thermostatically/manually controlled electric fan(s), I don't think you will need to change Radiator at present, but if you add an AC later, you MIGHT need to change it to get the operating margin back...road test at that time will tell...

Questions: Did the WaPu which came out have the formed sheetmetal impeller and did the one which went in have a cast impeller? That's the only difference I can see which would explain the cooling performance difference. What pressure are you making in the system?

Cheers