I thought a lot about buying a flex shaft grinder to widen the trough but haven’t followed through with it. I don’t own any other machines that would work. Any suggestions on tooling?
I did clean out the trough and lubricate it with 3 in 1 but no luck.
I do think it is a “parallel” problem.
My final thought was to have a left blade and a right blade. Each to be ground at the cutting edge to suit a sheet of paper overhang as the OP suggested. I think this will be a better solution than my initial response but I haven’t put it in practice yet. Bought the spare blade but not ground it yet. (For the OP: Larry Williams has a great video on the LN website on regrinding the edge of a blade that makes the process quite accessible.)