Just wondering about timing and maybe it's a little lean. Running either not enough timing at idle or not enough fuel under load can cause your problems.

Got a fuel pressure gauge you can see when it acts up? Those blue pumps want to move a lot of gas, If there a restriction on the suction side they will vapor lock pretty easy nowadays with todays gas. Too much fuel pressure will also cause your problem.

220 degrees is too hot, it shouldn't go from 180-220, something up. Unless you just got done climbing Peaks Pike or something.

Just a couple things to check.