After A/C Add On Engine Overheats Really Bad

Yes it has a fan shroud. I have run a 160 degree thermostat and a flex fan for more than 30 years and the temp gauge never made it to the first mark. As far as I'm concerned it's bone stock, I'm not splitting hairs with fans and thermostats. And I don't think I'm "smarter than Mopar engineers" either. I'm just asking for some ideas and I appreciate the one's I got. Thank you.