Hey Froggy..
I found another 12" dob as bad as yours! Darren (wombat_in_space)'s 12" dob is about as bad (if not worse) than yours! I needed 2 people to push the scope to move it 1 degree
Hope you get it sorted!
Also don't forget to simply try loosening the centre bolt, put some milk bottle washers on the middle hub, and using armorall to give it some smooth motion.