That's looking really nice. New rubber mat sets are VERY spendy but I think VP have carpet sets for a reasonable price. That would finish it off well.
I see from the engine pic that you appear to have a splash/deflector plate under the rear carb but in idling conditions that will just get hot too and the rear float bowl will heat up. A rather larger plate could be made to go behind both carbs with an extra "wing" at the rear. This might help some. Sitting idling in 95º heat is asking a lot from the set up without problems and there won't be many PV's that get within 10 or 15º of that. It may come down to a combination of things. Percolationg of the fuel tends to keep the float valve shut, at tickover the pump is working at it's slowest and the diaphragm may be a bit tired, and the tank might have some rusty flakes in which makes life more difficult for the pump. If you've managed to set it to a smooth but very low rpm tickover, which is always very satisfying, that might be counter productive. 850 rather than 700rpm would allow the fan to move some more air through when stopped.
Have you got the steady bracket fitted between the bell housing and the exhaust? This reduces the chance of the manifold cracking but might also help as a heat sink as well.
Good luck.