Is the B screw adjusted correctly? If the top of the cage is fouling give it a couple of turns in? Issues like this are normally more B screw related than chain length.
Sorted!
Brought a Sunrace ‘goat’ hanger extension and now I have All The Gears hurrah
Also helped to swap the back plate of the mech cage around to be facing the right way doh
Test / set up ride just now…
Good things;
Not so good things;
Not good thing;