I always run resistor plugs for the same reasons. On the Phantom I always ran an NGK BPMR7A plug (part Number 6703) which is the same plug ran in the Stihl saw the Phantom cylinder was based on. It doesn't have any thread stick-out like the B6HS and similar plugs do, which reduces hot spots and also improves the heat dissipation efficiency of the plug, which means a hotter plug can be run without issue. That helps neutralize the fact that the plug I like has a projected electrode, which generally acts as a slightly hotter plug than the heat range number suggests.