Not sure if this will help but my friend gave me a good tip for knee hold stuff – stand beside your pole and hook one knee on about hip height, as though you are about to start side climb, or kamikaze spin. Then, maintaining contact with the pole with the back of your knee, straight your leg and then bend it back into the hold. It gives u a much stronger lock, you can really feel the difference! I guess it might not work so well higher up on the pole, but it might help to give u a bit of muscle memory with a good tight lock =] let me know if it’s not clear ill post a vid showing u what I mean.
also, u are probably already doing this but just practice practice practice knee hold stuff ! I only really discovered when trying to learn a cupid flip into Gemini that my knee hold was rubbish and painful and I could not rely on it at all! I thought it was fine cos i was comfortable in Gemini and Scorpio , i hadn’t really realised that whenever I did them that I did the sort of ‘open’ version where the whole length of my calf was resting on the pole rather than with a bent leg knee pit hold. So I started trying the ‘closed’ versions much more , really painful at first but now a few months later it is sooo much better and a funny thing – I’ve noticed in my recent videos that often I will do closed leg hangs naturally more often than the open ones without even thinking about it haha ! =D and i am feeling more secure in my knee grip in other stuff like climbing and sits etc. So my advice is to keep drilling knee hangs even though it might be painful now, it will get better =] I think it helps working your knee hold ‘down’ in hangs etc it’s a bit easier than working it ‘up’ in climbs etc. Hope this makes sense ! Sorry for the huge reply I talk a lot hahaa.. !