Over heating issues... Fan recommendation please
So after I swapped my front cover to from a v-belt set up to a serpentine belt in order to get the crank driven oil pump (which works great) and combined with Colorado's very high temperatures this summer, I am overheating only when I am going up steep hills when it is over 90F which is every friggn day this summer. My truck is a 4.6 and the radiator I had recored a couple years ago to a 4-core radiator and I run electric fans (Flex a lite 210). I just brought in the radiator to have it checked out and it flows great. I just can't keep up with the heat. I cool off very rapidly when I pull over, and I only get to 210F when I due pull over as when I see it go up, it appears that it won't stop and I don't risk it.
Part of me want to upgrade the fan to something even higher (it is a puller that does 2500 CFM, so pretty darn powerful) but I am thinking that might not do it since I am usually at freeway speeds. The engine pulls awesome--it can go in the 60's to 70's up when going over the hills in Colorado. But something changed when I got the serpentine front cover. The serp cover no longer had a water inlet at the back of the water pump--now I come out of the lower radiator hose and have 2 branches on that lower hose--one from the heat core return and one from the coolant resevoir. So I am thinking that I am not getting as much volume through my radiator as I once did. That is a theory.
I just redid everything, including the thermostat (twice cause it is easy). I have taken IR temps and the radiator is doing it's job. I use water wetter to help with the thermo capacity of the actual coolant.
I am thinking of changing out my front grill and getting a wire mesh one. (baby steps of cooling, every bit helps) and possibly upgrading the fan to something over 2500cfm (but I am doubtful that the fans are doing that great at hwy speeds?).
I would love thoughts and input.
I know trucks well. I built this one from the ground up and the engine from a block up, so I think I have covered most the idiot mistakes. I have adjusted the timing as a trial, I have changed the plugs as a trial just trying to rule everything out. It is running great--great power, plugs look awesome, everything is a go except when it is 95F and I go over rather step hills.
I am all ears :-) Help?