Thanks BITOG, I didn't think about the valves, I may look into that. I also like the idea of possibly going to 0w40 Castrol, that's what I'm about to put in the Mercedes and consolidating oil would be nice, interestingly enough the Acura TL crowd with the 3.7 J-Series that are known to have a huge oil burning problem have had luck with Castrol 0w40 significantly slowing the burn.
Based on my original thinking, and this thread, I'll probably bump up to a 5w30, probably shorten the OCI and go with a quality conventional this round and see how it goes, if it doesn't improve then I'll go HM or Maxlife. I will be changing the plugs in the next week or two, it'll be interesting to see how they look as they are original.