Looks like you're enjoying some carves. So don't beat yourself up too much.
Thought I'd throw it in there... the pureboarding guys would tell you to widen your stance, get that back knee out away from the front knee (likely helped by reducing the binding angle on back), and get low. Bend your knees, and with them apart, you create a more stable stance. Also, they'd say to turn your head further in the turn- look across and up the hill. Exaggerate this on heelside by reaching forward with your left (back) hand. Get your shoulders squared to the board (heelside), and drop down and try getting hips to go with the shoulders, perpendicular to the board. As mentioned above, a couple drills for this technique:
-Lie down on the snow, plant the edge on heelside. Are you sitting on your butt? If so, you're wrong. Rotate so that while on heelside edge, your right (front) hip is on the snow.
-Reach for the boots or board. On heelside, try reaching your left (back) hand right up to the curvature of the nose of the board. Can't reach? Get low. On toeside, reach with right (front) hand, likely just slide it along the outside/front side/right side of your right (front) boot.
-Do one carve at a time (maybe while doing the holding drill) and ride the carve all the way until it's done. Yes, until you stop dead with no speed and you're lying there looking like a noob on the snow. See just how stable you can be during the entire execution of the carve, where you'd like to release, etc.
I enjoyed learning those drills and have practiced them, they certainly change things up for me on the icy chop I call home.
*I ride mostly like you do, maybe a bit stronger into my turns like I used to ram gates.