We had V&H Power Duals and S&S Grand National slip-ons installed straight from the dealership on our 2020 with a stage 1 EPA compliant flash. The bike still got so hot that my fiancé's legs would get red marks if we were stuck at a light for a while. She eventually had to prop her legs up in my lap to keep from getting burned. It ran hotter than my old high compression 124".
I eventually had the cam replaced and had it dyno tuned. Now we could probably sit at a stop light for an hour and not feel the amount of heat it was previously putting out. Changing the head pipe, adding the cool flow fan, etc....Things like that will probably help some. But those are treating symptoms and not addressing the problem. Getting the bike comprehensively tuned will not only help with a better running, and possibly more fuel efficient bike, but I guarantee you will feel the heat reduction. My fiancé knows nothing about motorcycles other than how to hop on back and enjoy the ride. She noticed a huge difference the day we got it back from tuning. The show-stopper would be if you were still in warranty and wanted to keep that.
Hope this helps.