Update: I’ve still been struggling with AMS feed issues. I found this 2 year old reddit suggestion and gave it a try. It works great! I used BL 4 into 1 adaptors and couplers plus I used some dry lube on the AMS hub slides as well.
Bambu 4-in-1 PTFE Adapter | Bambu Lab USA Store PTFE Tube Coupler | Bambu Lab USA Store
https://www.reddit.com/r/BambuLab/comments/174au97/news_flash_you_dont_need_the_ams_hub_at_all/