I've owned several Riders Choice boards b/c they're awesome everywhere. I also rode the original Skate Banana for a full day. Both are soft enough to butter, although the SB is def softer. The RC is much better for all mountain though. Either one seems like it'll work for you. Since you already have a Custom, assuming you're keeping it, I think you're better off adding the Lib to your quiver.
16 NS West . 15 NS Snowtrooper BIA . 13 Salomon Pow Snake
15 Now Drive . 14 Burton Genesis
14 Flow Hylite