Your radiator hose is routed higher than the top of the radiator. That almost always creates an air bubble in the upper hose. The early V8s had a surge tank and the pressure cap was up there to make sure to get the air bubble out.
I would recommend trying a remote upper radiator hose fill. Several versions, this was top of the Summit racing search
https://www.summitracing.com/parts/hre-3423/overview/. Put a lower pressure cap on that and a higher pressure on the radiator. This will mean the hose fill will open first, venting air out of the upper hose. The cap on the radiator should never open. Run both hoses into the same overflow so if either sucks anything back in it will be water and not air.
I find it odd that you can drive around with the A/C on and it runs a perfect 205. But idle, with the 1100 RPM in neutral idle, it gets warm. If anything that should be the sweet spot where it cools the best. No load, a little extra RPM for the fan. The pictures look like it should cool. Everything looks right. The fan depth looks good (I can't see the diameter for sure but it looks fine), shroud, even the extra sealing. The only thing that looks wrong is the upper radiator hose has a high spot that is too high above the cap.