I have the same jig you used, I never liked it.
I switched to the dado stack but with a miter gauge and the piece on the tablesaw flat. But I do get extra work with a shoulder plane to smooth all the ridges I get from the stack.
On the project I am working on, I cut all the tenons on the bandsaw. a little easier to handle. No tear out. Pretty clean.
Sanding and finishing is my nightmare. I try sanding and pre-finishing all the pieces before glue up but I still have issues here and there. It’s never fun for me.
Are you building one door at the time?
Abbas, Castro Valley, CA