Don't worry. I regularly ride switch, butters on a stiff, cambered slightly set back board (old nitro suprateam). Not only that, I can even ride switch comfortably with foward stance (+21,+9). If you like your current board, you don't need to change. If you hate your board, then switching to a soft, twin, reverse camber will probably be easier, but you will be a better overall snowboarder learning on your current board.