cjd86, only saw your post this morning. Maybe it was delayed from view as a new user? Or just missed it somehow...
I agree w/ Harald. Bottom of the swing (hinge) looks really good. Great neck-T-spine-lower back alignment! Looks like your knees might be coming out a bit much, but hard to tell from that angle. Timing and everything else looks good at the bottom. Top of the swing, not so good. Find a straight line; be a board; don't lean back. Also your last rep -- straight back! -- don't round your back or lose any tension until the bell is safely parked. I'd recommend lighter on the 1H swing for now, too. Need more lat engagement. A lot of the timing and other adjustments may work themselves out once you find that good standing plank for both 1H and 2H swings. Practice that as Harald suggested; another description of the same thing: screw your feet into the floor with slight outward turn; pull up on the kneecaps (tighten the quads); squeeze the glutes (and with that slightly outward turn of the feet, you will feel all the muscles around your hips tighten as well, bringing your hips forward to perfect lockout with your legs and abs; brace your abs; pull your shoulders down towards your hips, with a big chest; neck in line with the rest of your spine. And since you have the video to give yourself feedback, practice the hinge-to-standing-plank movement with no kettlebell, or just doing a kettlebell deadlift. Make yourself as straight and tight as possible in the standing position. Then try the same thing in a 2H swing with a light kettlebell. Hold the plank as long as possible as the kettlebell is descending, before you hinge. Then go heavier, as long as you can maintain that good standing plank at the top of the swing. Keep videoing youself; you will see a difference, and you will start to develop more power and it will be safer for your back.
All in all, not bad - I've certainly seen worse, and a good idea to post a video for feedback! Good work!