Can't figure out this damned oil leak

Well, it's leaking again. Not enough to keep me off the track, but enough to where I have to wipe it off the K member after 2 or 3 passes.
Someone mentioned that if the block was align honed, the crank may be sitting a few thousands higher up in the block, but I would think the seal could compensate for that.
I'm not going to replace it again, just keep checking and wiping in between passes, it's just a few drops.