most t-stats take approximately another 10-15 degrees to fully open.
i used to be concerned about running hotter than say, 180, but not any more. 230 or 240 for extended periods might make me just a little concerned, but if the temperature returns to around 220, no big deal.
a 16lb. cap with an overflow return tank, plus a reasonably sized and clean radiator, [even a 22" will cool more than you think] and the fan[s] of your choice, will cool all but the most finicky rides.
plus, it helps keep the engine internals cleaner, longer.
my opinion and experience only, after playing with these toys for over 55 years.
obviously, your mileage will vary.