heres a general run down of tunes
Down hill: 0 degree Base 3 Degree Sidewall this tune hooks fast very unpractical
slalom: 0.5 degree base 3 degree sidewall hooks very fast, good for had pack
rec/ general good tune: 1 degree base 1 degree sidewall- this is what most skis come from the factory, works well
any BASE tune over 1 degree is going to SACRIFICE edge grip/hold on ice/hard pack. it will however catch less on rails.
if your going to make a jib specific tune then you could go 2-3 degrees underfoot with a 1 degree side wall tune. i would keep this underfoot only, use standard 1degree base 1degree sidewall through the tips and tails if you every plan on being able to make it down a hill.
any other tune questions feel free to PM me.
And for the fragile force of an agile horse
Here's a handful of very special chocolate chips