There really isn't much wrong that I can see. You don't look like you're locking out fully at the top, but that's about it. Speed throughout looks good and constant too. Is that 325? For me, I'm fast out of the hole, slow in the middle and fast at the finish.
Maybe trying a more upright torso would help? I know that's not quite what you get with low bar, but even just trying to keep a straighter upper body might help you with your speed. Try a closer grip if you can, that helps me keep my chest up. I'm basing the whole upright body on the fact that your low bar technique is ovbviously good, so the lack of pounds on the bar isn't technique-related. Have you tried plain old high bar squats? Or even higher bar without going too high? I'm thinking with your 525 dead lift your lower back is definitely going to be strong enough to keep your trunk upright.
Just for an example, my max dead lift (conventional, narrow stance) is 473 and my max squat is 396 with a low-ish bar, wide-ish stance but quite upright torso. Bodyweight is about 190 and like I said I'm 5'9" or so.