from what ive reade prob should be back like 2.5 cms
If you're doing a LOT of cliffs go 3-4cm back in my opinion, they're so soft in the shovel that if you land forward you'll go straight over the front.
Binding? Probably Griffon with the extra wide brake for ease of fitting. If you don't mind messing around with brakes a bit, FKS140/Pivot 14, or, if they're in your DIN range, those super cheap PX15s someone mentioned.