I remember reading a long time ago, but will take a bit to find, a couple track guys found a product that was temp stickers or something. Basically you can apply them and they change color to when they get to certain temps. This might be helpful to find out if you are having pockets of hot air stuck in the engine bay somewhere.
Another quick idea might be the moment you are done with a run, jump out and have an IR heat gun that just do a few key spots and capture the temps. See how hot the pipes, coolers, etc are really getting. I see Amazon having one on sale once a month for under $20 which is a good deal. Plus the gadget comes in handy at home if needed.
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