[lippy]

Like I said before, I think there is sone thing else going on here. You already have big PV restrictions and big jets and you are making radical changes that are only helping marginally.

If I were you I would pull a few plugs and cut them with a hacksaw so you can see the whole insulator. Inspect for color (mixture) and specs (detonation). Plugs don't lie, wideband meters sometimes do.