At the risk of offering yet more confusing advice, here is more advice.
Efficient skiing involves manipulating fore/aft pressure along the ski. If you're not moving your hips relative to the skis you are leaving performance on the table. Weight should shift fore and aft through the turn. In the top half of a turn, the skis accelerate. If you don't do something about that, the skis will pull you into the back seat. If you don't have upper/lower body separation (i.e. counter and angulation) and hip/shoulders ideally (but never actually getting there) parallel to the snow surface, then you will find it hard to prevent yourself from getting into the back seat.
Thoughts like "stand taller", "expose your belly button to the wind", "Tony Knows how to ski" (keep toes, knee and nose in vertical alignment on average) and "long leg/short leg" have been known to fix this issue. Boot work has been known to fix this issue. I often use a drill where you tap the tip of one ski (uphill ski, then downhill) while doing a traverse to test your neutral stance. If it's hard but you can eventually master it, your gear is ok and your stance just needed work. Drills like lifting the inside tail, skate to shape and hop to shape work on getting the center of mass to travel the shortcut path to the inside of the new turn in order to keep up with the skis. Drills like picture frame, tug of war and bamboo over the shoulders can help develop body alignment adjustments that enable more efficient hip movements. Having an instructor to do an in person evaluation and custom select drills for you has been known to be a far quicker way to resolve this problem. Caveat emptor - I am an instructor.