Thermostats - high flow vs standard flow - now I am confused

Thanks all, have only driven the car twice, 8 miles. Overheated big time on first run, original copper radiator and flex fan, 160 high flow stat and water pump. Switched to a 3 row Champion radiator and lowered to 200. No shroud with a 17" flex fan 1" behind core. During build I installed AC and I think the AC condenser is to small and it does block part of the hole for the radiator. Next run I'm removing it to see what happens.