Yeah, I've adjusted both focus rings. The outer ring is just for the corners and I have a similar problem there where I can get the top two corners or the bottom two in pretty good focus, but not all four. I've tried rotating the spacer on the green lens to see if it made a difference and it doesn't seem to. I've even tried putting thin cardboard shims in different places and that doesn't seem to help much either. It's not a horrible problem, but for a perfectionist, I'm just not happy.
How do you know which spacers are 300inch? Mine are marked R-2 REAR, G-2 REAR and B-2 REAR. I've tried rotating them to use the different holes, but that didn't make much difference. I've been using the center hole and that seems best. I'm using a 92x52 screen and used PJCalc to get my distance, then adjusted it a bit to make sure I was using the maximum amount of CRT area.
Thanks,
Brian