We started learning this technique and I humbly submit this short clip of me performing ganseki otoshi. Any constructive criticism or thoughts are welcome.
I believe this is the correct way for the uke to land, on his feet. from what I understand any other way would be dangerous to uke.
It looks to me as if you are bent over too much. Definitely not the OSHA approved lifting method. I think the legs need to do more of the work or you risk throwing your back seriously out.
If you look at this still shot of Saito Sensei (halfway down the page) his back is much straighter and his head is up, making his back much stronger.