Mag won’t feed high speed set up

Sorry had to post here as I can’t post in tech talk.

So I have my gearbox all set up, currently 38-40rps.
But the stupid gen 9 mag won’t feed fast enough, both 7.4 and 11.1 spin pretty much the same speed.
I never had an issue with my Wells M4 mag, that goes into hyper drive on 11.1. It could feed 45rps no problems.
Not to mention the capacity to hold gels in the gen 9 is pretty piss poor, no idea why they’ve added that extra cog.

Anyone else had this problem?
Left gen 9, right is Wells