A 5-10 degree rise in coolant temperature at stop lights is acceptable as long as once you get moving it goes right back down.
If the engine is more than 10 degrees over thermostat opening temperature just bee-bobbing down the road, keep working on the cooling system.
My simple rules:
You can’t get “too much” ignition.
You can’t get a pushrod that’s “too stiff”.
You can’t get a fuel pump that’s overkill.
You can’t get the radiator too big.