A833 shifting problem

Pretty much every time this is happening is because the clutch disc or pilot bearing/bushing is dragging.
Could be a warped disc, a dry pilot, or a simple adjustment.

I assume “engine too high” means Z bar alignment if it’s a mechanical setup and not hydraulic.

Sometimes I will put a pipe or board on the clutch pedal and use a good light, the reach in through the fork opening with a long thin screwdriver and see if the disc moves easily.

Well, that’s how I do it when I don’t have help.
Which I never do.