On the sprint, its hard to tell from that video, but it looks like youre getting into top speed mechanics too early, try to stay down a little longer at the start, once you raise up and get into top speed form, its hard to accelerate anymore.
Double leg bounds are getting better and better, one thing that will help you is getting the hip flexors more active in the air, get the legs into landing mode a little earlier and the time spent amortizing between landings will be cut down drastically. Definitely better and better each time youve posted, so good work there.
Single leg bounds- pretty good, youre pelvis is shifting more than it needs to though, youre allowing the hips to kick back on landing, taking a lot of the glute out of the bound. I would advise that you do both single leg bounds for distance, and single leg bounds for height, then combine the two eventually into a finished product, but atm your form is going to break down if you try and combine max height/distance in the same set. Focus on keeping the hips stationary, the low abs/psoas have to be turned on hard, and the pelvis needs to be "locked" into place. Think about not letting your pelvis move throughout the entire set. The less the hips sink on landing, the better. Youre likely going to have to do this sub maximally for a while, but it will pay off in the end.