Seems most of my overdrives rotate but don't fully click in with the boom height cam once on the otherside. I have to bash them with my hand and that doesn't always work. I'm not fit or strong enough to give them a big whack/pull like the guys do..
I'm not sure if it's a recent problem or I just didn't notice it before..
I thought I'd taken all the spacers out but I found one in the 7.8 m yesterday and took it out and that was much better! Still needed to click fully but didn't take much of a gust to have it work.
The 7m doesn't have any spacers in it at boom height and I still need to check the 5 & 6m. They range in age from 2014 back to 2009 ( 5m prototype - hardly used).
I use a 460cms severne mast in the 7.8m + 7m..and a 430 in the other 2. I really need a 400 for the 5m but that will have to wait till finances improve. It has a turban top and I run it with 30cms at the top.
What sort of things can cause cam rotation issues and what can you fiddle with to help?
It's a pain coming out of gybes without full power and missing out on gusts for the same reason..
I have my boom right at the bottom of the cutout due to my size. I tried it a bit higher with the 5m but that didn't seem to fix the issue.

I dont own Overdrives so i cant say for sure.
I do find on all my cammed sails the less downhaul the deeper the profile and harder to rotate. more downhaul ? Also less batten tension if you can. (I know it feels good getting the sail tight as a drum but a tiny crinkle in the sail makes it flip a lot easier )

older Severnes were more hard top than currently - watch before you buy and what you are using now
as the cat says - more downhaul and less batten pressure help
mine are MauiSails and what helps\helped me is McLube - dry lubricant
put it on the inside of the cambers - when i remember - makes a difference