I hear ya! You do all that work and it's not fun to drive because of the vibration.
I've been through the same steps. The latest is I ordered a new flywheel, pilot bearing (not bushing this time) and clutch fork/pivot. I'm hoping the input shaft was vibrating either due to an out of balance or out of true flywheel or some issue with the pilot bearing. Teardown about to start, will let you know the results.
My theory on the input shaft came when I realized that if I got the car up to speed and the vibration was strong, and I pushed in the clutch I could make the vibration stop by revving it in neutral and then putting it back in gear. This gave me the impression that the input shaft could "walk" and when I pushed in the clutch it found its own state of balance. Did you try that?