Knee lift is a matter of comfort and balance I think. If you aren’t comfortable with a high knee lift, then don’t do it. My opinion is that a higher leg lift can encourage a more dynamic and explosive move to the plate, but I imagine there are those who would argue differently.
Having said that, you tend to “spin out” of the load portion, that is, instead of picking the foot up, then bringing it down and then forward, you swing it around and then down. This awkward motion is used by some major leaguers, but is a very difficult motion, and if I were working with you I’d suggest you bring the leg up, straight to the target, turn toes to target, then plant.
One way to eliminate the swing is to work from the stretch (with a slide step if it’s more natural or comfortable for you), concentrating on moving the GS foot to target instead of out and around.
One other thing I think is happening here is that you aren’t throwing with enough aggression. Your stride is relatively short, and your body looks like you’re in slow motion. I am a very aggressive sort, boxed and played hockey and mangled my own (and some other’s) bodies in my day, and I always look to the more aggressive guys as the ones who can produce on game day.
It is a gift for those who can be mentally aggressive while remaining physically relaxed…but it is also something that can be learned if you really want to. Again, just my opinion…
By the way, WOW! Your english is waaaaaay better than my Russian!