I think you could dunk right now if you were to improve that clumsy looking plant and approach... it looks REALLY weird. It used to look better... wtf...
Look at how you "depth drop" over a very short drop and a weird angle
Not necessarily pause squats... it's just that those dive-bomb squats put a ton of pressure and damage on your connective tissues, and these connective tissues don't recover as fast as the muscles (they have less vascularization, so they recover harder).
Overtime, they get too damaged.
That's why as Kingfish does squats daily or so, he can't afford that damage. That's the reason for his paused squats (among others).
In your case, just be more solid on the eccentric phase.
Hey, nicely done. Yeah, in the 2-leg bounds I get a lot of quad load as well, and also a "very positive" shin angle. So it definitely looks really quad dominant. But at the take-off point, you still have to push those hips forward with power, and that's paramount. Just don't go overboard.
I can relate to that double-bounce on the landings. It happens to me when I do 2-leg bounds for length while barefooted. It seems that it's a strength issue for me, and I let the passive elements take in the shock and "bounce" on every landing.
If anything, try to be smooth, don't CRASH, even if it means you're going to go shorter distances.
It's nice that on the speed bounds you did better, so you're capable of it.
Keep doing what you're doing and consider getting a kettlebell. It's about ~100$ here in Romania, at 24 kg, and you will have it for your entire life if you don't drop it or something.
For the donkey ankle bounces, you should be extremely quick and WITHOUT loud noises:
Then you don't have enough "strength" IMO. You should use a slower descent and less weight. Safer, and more time under tension.
Use a faster descent on more specific stuff like half squats, and even then, you can do Lance's quick dip only in that specific range of the amortization phase.