The only other thing that I can think of is to check your polar alignment as IIRC, my altitude clutch slipped once on my German Equatorial Mount and my GoTo’s were consistently off by the same amount.
Some mounts require precise Polar Alignment for accurate GoTo operations, whereas I think my Vixen GPDX could model the errors the more alignment stars I choose and sync’d on. Good luck!
Cheers
Dennis
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