A833 Can't Downshift / Poor Performance

If there is an issue with the trans, obviously that needs to be fixed first.
When you get it straightened out I wouldn't use anything but Red Line MT-90 or RED Line MTL.
MT-90 is a thicker vicosity MTL is a lower viscosity.
I put the MT-90 in my 833 and it was a game changer in regards to shifting. Really smoothed the shifts out.
MT-90 is the recommended fluid at Brewers for an 833.
Works for me.