I repeat what I said earlier, 200- 210 degrees in stop & go traffic is acceptable, as long as the temperature drops when cruising. If you want better results get rid of the flex-fan & do something about that restrictive shroud.
It is, I agree 100%. Here's where the problem can come in though. In the south, in middle Georgia, this summer weather can and will tax a cooling system to the boiling point.....pun intended. We're fortunate enough to live out in the sticks where it's a 20-25 minute drive at the very least to "anywhere". I prefer to get one running as cool as possible because of the possibility of getting hung up in traffic in either Macon or Milledgeville. Gray is not an issue, since the population there is only around 3000 on paper.....even though probably 10K people are there during the day. There ain't but THREE traffic lights. lol
All that said, the cooler a hot rod runs, the more "space" you have until the cooling system becomes overtaxed and cannot shed heat anymore. ....and it can and will happen to even the best cooling systems under the "right" conditions. If one is running as cool as possible, you have a lot more room before that happens.....IF it ever does.