Damn. I did another compression test before I came to school today. Where I was getting 160's-170's a few weeks ago, I'm only seeing 145-165 now. The plugs looked fine, although #4 had a really rusty look to it, and slightly more 'burning' around the ceramic base than the other plugs, which got progressively 'better' heading towards #4.
And yes, the timing marks ARE set right. ):
