The faster you move the harder it is to pivot with the left leg. Masterbeato posted a link about Steve Terada doing double pivot in a martial arts show. And MB wrote about double pivoting adding more power. Double pivoting is different from pivoting with both legs. Double pivot has the left leg pivoting from the x step prior to the right leg plant whereas pivoting with both feet after the right foot plant.
Seabas here are a couple of observations from the later shot video. Your left leg ain't going the Feldy style to the right of the right leg or staying on the ground until past the rip. So you can't push forward and turning to the right. You lose speed from the weight shift forward and some of the snap because you don't accelerate as fast. Reasons for this are counter force to the arm chop and lack of all the power available from the left leg. The faster you rotate to the right the more the wrist gets bent back force wise and if you can resist that while staying fluid (i think Avery Jenkins meant the same as Blake does with fluid wrist) the faster the wrist will snap.
You can test the effect of the counter force of the arm chop by standing on the right foot alone on the ground heel up or ball of the foot up depending on how you pivot and make the arm chop so that the back of the right hand is touching an immovable object and starting the motion from the right pec position going to the follow through. Something is wrong if you don't turn your body opposite the direction of the pivot.
You still raise the right leg to the right when your chest faces 90 degrees left of the target. That will lengthen the final step and it requires more left leg push strength to maintain the rest of the form. It also makes the pivoting of both feet after the plant more difficult. You also move so fast that it may be difficult or perhaps impossible to pivot with both of the feet simultaneously after the plant.
Your left leg push is a swimming start forward and up. Deleting the upward angle and converting the direction of the push to forward and at lower speeds to rotational too will help a lot. It is easier to turn toward the target once you keep the left leg on the ground and keep on pushing hard to the rip. But you throw too far already and fixing this will make you throw even farther. I hate strong people that don't need to have perfect form and still out throw me
Flat shots need running on the center line of the tee and planting each step on the center line. Anhyzer needs running from rear right to front left with the plant step hitting the ground to the left of the line you're running on. Hyzer is the mirror of that.