You've not mentioned how old the water pump is. I had no details of my belt and pump change, While the belt looked newish the pump looked old. I replaced it and my temps stay down a lot more than before. A good quality coolant product helps too.

My car has airtec rad/FMIC/turbo cooler/ twin 9' kenlowe fans/uprated stat/Good coolant/new pump/new sender and fan switch/Fan over-ride switch for one that runs of the stat and a switch fused to the stereo for the 2nd fan if it ever need to use it for traffic. Yes it gets hot, but not like it did before the pump change.