I wouldn't mess with you stance too much while still learning as long as it's comfortable. Once you get more comfortable on the hill, then start tweaking things like that having more knowledge of what you are looking to get out of it.
Exactly, if it feels comfortable now, leave it. Just work on bending your knees more. Literally just do a squat while you ride, you can bend your knees quite a lot while boarding, try different levels and see what feels best. You're knees should be at least at a 45/135 degree angle on the inside.