Burnt Spark Plug Boots

Anyone else with a 440 in a a body (demon) that are having issues with burnt spark plug wire boots because the headers are sooooo close? I recently set fire to my #7 plug even with thermo shield boot (might not have been cover/protecting as much as it should have). But i see #4 and #6 having similar issues just not happen yet. I used the accel wires rated for 500degF

Are the hooker/TTI/ other headers giving similar problems or solve the issue?

i have tube headers that PO banged up pretty good to get the spark plugs installed.