pulling to the right

Throw one more on the pile. Using a '69 up adjuster with a '68 down system, or vis-a-versa.
https://www.web.imperialclub.info/Repair/Lit/Master/index.htm
Grease or oil. Any grease or oil on the lining can cause lock up. Has sent me into a 180 while autocrossing on several occassions - which is what clued us into an axle leak. Depending on the extent of contamination sometimes brake cleaner can be used to remove it. Once its really in the lining and spread over a critical area I've always assumed the lining is ruined.