Running a little hot, but only when a/c is on

[mike100]

Facts:
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-Ambient temp 90-100F
-Gets hot when stuck in traffic- (0-20 mph).
-Coolant runs at 232 deg F with a/c on which is a couple of needle widths from the red zone on analog gauge.
-cools down when going 50 mph with a/c on
-cools down even faster at any speed when a/c off
-Will heat up parked in the shade with a/c on (car already hot from driving in traffic).
-chip programmed to run both fans over 205 degrees.
-orig water pump
-coolant full

It reached 232F (peak of 234) with the a/c on and would not get hotter. The car will also cool itself down to 205 degrees (a/c off) parked with the fans running until they turn off. Both fans spin, but I have not checked the bearing on the r/h one yet, but the left fan spins full speed.

theories-
Needs a new radiator? it was out 18 months ago and was totally cleaned at that time.

Garbage blocking a portion of the rad air flow? the condenser is totally clear though.

Even though it does not overheat per se, 230 is a touch warm and it pings a lot running like that. I did not notice any thing like this last summer.