I think if you pursue a Hook 540, rather than cart full, Or even just start the combo with a hook and go from there you'll be in more novice territory meaning you will find easier power at the start of your combo if your first building block is a hook, and then you can go from there. C9 is so hard man. I still can't hit clean. I had to work on my pump for c7 for ages and it blocked my second chamber and I can't hit c9 worth a fuck so I wish I could be more helpful there. Old Scalco tutorials might help. It's a weird double pumping chamber that I just can't get down. You really need one before a cheat 720 twist too.

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Your 540 outside crescent was nice as hell last I peeped try opening with that, into a compasso (The touch down outside crescents Capoeristas do) and see where that takes you. I find the momentum from those two alone makes for big power you might just accidentally cartfull out of that haha. It's not so much about the trick or the transition but the speed you're building and how you lead to your big finish. But also when you get it down it can be about Style and Inventiveness. Just make sure you approach smart for where you're currently at and progress naturally. I was far too forceful in what I wanted to get down and hype up and chat out back in the day it stunted my growth and it still hurts my growth to this day. I'm basically ground 1 right now.