Replying to Backflips and spins?

ok so i can backie on my everyday day skis, which are light as a feather. this guy was telling me one day that heavy skis are good for backflips cus the momentum/weight helps you swing around. so i have a really heavy powder/touring setup and i want to know if it would be a lot harder throwing backies. also, on my touring setup the bindings are mounted at -6 or-7 so the swing weight is just awkward. how do i throw down in the bc on skis like this? i cant even do 360s these things feel so nose heavy.