I’ll add a bite for water wetter, seems silly but it definitely seems to help, I’ve been using 1-1.5 bottles in my dart and barracuda. I have started using the Flowkool water pumps, more blades and seems to flow better. Timing/AFR have been the culprit when I couldn’t get heat under control but once they were dialed in even on 100 degree days in CO all three of my Mopars have stoped creeping above midline and to the better turn the heater on high/hot to save going to far. /6 (Torqstorm), 340 and 408 all had issues but one step at a time all solved now.