As others have said, your basic turn actually looks pretty good. One simply way to keep more weight on the rear foot is to work on your lead changes. Most of your lead change is happening when you take your old trailing ski and push it forward. The result is that your center moves over your new lead ski making it hard to not get carried past the point you can still weight the trailing ski.
Try moon walking. on the flat slide backwards pulling one foot back, then the other. figure out how far back you can slide your foot and keep weight over it. Now try a few turns making your lead change by pulling the new inside foot back. As you go through the lead change you have been mostly picking your heel up, rather then bending your fore foot at the bellows. Think about placing your foot on a flat surface. What you tend to do is pick up your heel, pivoting around your toes. Try instead leaving the ball of your foot on the floor and pick up your heel by bending at the ball of your foot. An excellent example of this is looking at the hind leg of a cat or dog. they are standing on the ball of their foot and what we think of as their shin is our foot bones, and where there knee is, is actually the ankle. Your practice of pushing the cuff of the boot toward your toes is a good way to work on that. Just be sure you are keeping your forefoot loose and let it flex as you do it.
As you get more comfortable with keeping your feet home start thinking about your upper body. It's not that you should lean back, it's that you should be more upright. Think about how you settle into a rocking chair. You don't stay bent over at the waist, neither do you lean back to meat the chair back with your shoulders. You keep an upright upper body as your hips move back into the seat. A simple drill to try is... Take off your poles. Hold both in the downhill hand while you start in a traverse. As you turn downhill start reaching your hands behind your back. More or less on the fall line transfer your poles from one hand to the other. As you finish the turn bring your hands back forward. You should again have the poles in your downhill hand.
Thing number 3 to look at is how you are steering your feet. Most of your steering is coming from the knee down. If your foot was flat on the ground that twisting movement that would turn your ski. Unfortunately with your heel up in the air that movement has been translated 90 degrees and is now an edging movement. You already have the answer. Pointing the knee where you want to go. Rather then twisting your inside foot rotate your whole leg from the hip socket the direction you wish to go. I visualize it like the inside knee of grand prix motorcycle racers. It really lets you pressure the cuff of the inside boot as well as twist the ski all the way through the turn.