man i gotta say, your dedication impresses me considering how little cnc you've recieved. I'm atrocious at tricking and parkour so im not gonna comment on any specific replay but ill explain a little about your confusion.
relaxing more joints doesnt make your replay better, the goal is to use the relax and hold after contrac/extend to soften the effect and make it look smoother. simply relaxing some joints won't make it better.
frameskipping is just when you dont move any joints for a considerable amount of frames. to avoid this, you should try more to move every couple of frames while maintaining fluidity instead of just instantly going into the next move and waiting to land or w/e. at the same time its important to make sure your movements dont look slow, and to maintain your momentum. this is difficult and will really help your skill once you get it down.
the replay you just posted, at the start was pretty ugly ngl cause of the right arm twitching, however after that it was silky smooth except for when you first contracted your elbows, it looked a little forced and jagged. also try and stay in the cork spinning position a little longer, it seemed to me you entered and exited for the landing in a matter of a couple dozen frames.
also put in the effort to make a nice stable pose where you dont fall down and try to have it like that upon landing. another tip is to keep your pecs shoulders and elbows relaxed during your pose, other wise it will look rigid and unnatural.
another thing and this is really tiny but try and limit your matchframes to the actual action in the replay. its pretty simple to change the matchframes in a replay through textedit or notepad within seconds, this can also help you avoid having to pose too much because itll end quicker hiding some instability.
overall youre realllly good and i hope you continue to improve.
Last edited by xmas; Jul 31, 2019 at 07:46 AM.