Pete, how many types of wax do you have? You'll probably need about 4 temp ranges to get through the rest of the year. Another thing is edge tuning. If you like your edges @ 90* that's easy enough to keep in good shape, but bevels and stuff are gonna make it harder to keep tip-top.
I just spent a couple minutes on the boards of the guys that went this weekend, and nobody really complained about edge hold. Of course, their riding style is going to be hard to hold an edge, regardless of tune, if ice is a factor.
My F2 has only a trace amount of medium temp wax and a stock edge tune, and I can hold in pretty much any situation. Once the weather warmed up on Sunday my speed came up too.
good luck this weekend!
That Big-Air comp. at Bittersweet was pretty freakin sweet though.