With the Mountune radiator installed, and the AC off, it still hits 235*F?!?!
Most on here claim their cars run hotter, factory radiator or not, with the AC on, but for me, just like you, that high speed fan kick on keeps the coolant temps down below ~200*F for me, on the factory radiator, regardless of how hot the ambient temps.
Granted, in the summer I change the coolant to water ratio to ~30/70, and add a cavitation preventative (Kool-It additive), but that is only going to help, marginally at best.
Turn the AC off, and it will steadily climb up to about 218*F max for me, currently.