DSX "pulling through" the string plane

I'd like to get to 300 bpm straight alternate picking, I've been working more wrist and less rotational forearm because I feel like it gives me more precision and control with the pick. I'm experimenting with this kind of moving laterally out of the string plane to minimize the hopping, and it's going pretty well, but still breaks down a bit around the high 200's. Need some extra eyes on it! Happy to elaborate or make more videos. Thank you!!