Who the hell is telling you a smaller shorter board is going to have more grip? That's positively ridiculous and utterly wrong.
I ride a 153 and weigh 150lbs. How does it make sense that you are going to get similar edge performance as me when your pushing 50 more pounds into the board?
You don't need to go shorter and get camber, stay the same and get something stiffer with better edge hold. The Endeavor Live Reverse
is a solid all mountain freestyle board that will be super fun to jump too. The YES Greats
like I said is also a great option.
If you really just have to have camber and smaller, Get a Ride DH 155, Nitro Factory Rook 156, Burton Aftermath 155, Flow Quantum 155, Arbor Relapse 155, or a Salomon Sabotage 156.