My daily driver has the stock radiator with the DUAL fan kit from ramchargers.
With my AC on in the summer, my coolant temp will rise to 192° to 205° and my stock radiator has been cleaned out with the RMI-25. This is when its 104° out, high humidity and me NOT getting after it for a 45 minute drive home, and all my baffles are in place in front of the radiator.
The RMI-25 works great and gets rid of alot of your deposits in the coolant system, but now that i look back on it, i would rather have just installed a new f-body aluminum radiator from napa.
You should consider getting a dual fan kit and replacing the radiator with a new one depending on how hot its gets where you live.
I dont think 205-210° is too hot, but it would be nice to drive in the 100° heat,get after it and keep the temps down to 175-185°
BW