yeah i started snowskating with one of those plastic premiers that have a 90 degree angle as an excuse for a nose and tail. With those boards and similar ones i find the problem is not the angle of the tail but the fact that the top of it (where i put my foot) is SUPER slippery like OMFG.. so to fix the problem i took a saw and cut 1 cm grooves perpendicular to the tail on the top of it, so that my foot would not slide from side to side.
Once you begin to require a wood board, i would recommend that you buy a premier, the shape of premier boards are the best out of all the companies and will make any one coming from skateboarding feel at home.
The only problem with a premeir board is that they will break easy and you need to get snowboard wax to keep them moving fast. If you want a board that doesn't break, has more control and is consistently fast get an ambition, Unfortunately i don't believe ambitions have any concave
Side note: I wish that there was a company that used ambitions base and premiers shape and icons grip. That for me and probably many others would be the perfect board.
Just put screws in your premier, it will hold up much better - hock. Łøł