Okay, back at this one... After getting the new oil pump installed, I figured I should also get the Granberg figured out. That wasn't so tough once I had it all in front of me, though I wasn't so sure about the angles. I used 35 degrees with no camber to the cut - for reference, the chain is an Oregon 95VP072GH.
I went ahead and filed away more than I would have, wanting to make sure each side was fully cut near evenly. Initially, working on some small stuff, I went through the wood like butter. As I got to bigger stuff though, the two old issues starting to raise their head:
1) Cuts want to pull to the left
2) Cuts that require the center of the blade getting into the cut seem to dramatically reduce the effectiveness.
On the later point, I found that by using the end of the blade, or plunge cutting, I could get a lot more work done. Otherwise, if I had a 12"+ diameter log, once it got into it a good amount, it felt like I was cutting iron. Definitely NOT bogging - the engine was at full RPM almost like it wasn't doing anything.
I realize that I really just need to get a new chain, and isolate once and for all whether it's a chain problem or not, but any thoughts on what else could be going on based on what I've provided?