I installed a motive set in my brothers 9" ford a while back. I remember the sheet of paper that came with them called for more backlash than the original factory service manual did. I was sort of reluctant to do that , but did. So far so good with it. Might be worth looking into, wish you the best. Every set up I have ever done I have only take apart 20-30 times to try to get it the best I can. Way to much OCD for me to do that for a living! LOL
Matt