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.
So just to decrypt this; Are you still running the 17" flex fan with no shroud ? Is there a fan-clutch?
And at what speed does the overheat occur, and at what rpm?