Hate those reaming problems, had too many of them from the boss.
Seriously, though, in another thread I addressed the problems with getting the Magnecor's to seat completely on the plugs,
since they are such squiggly suckers as opposed to the OEM metal cased ones.
I never got mine TRULY seated until I had the valve covers off and could really get to them.
( and YES, I did use diaelectric grease the first time )