Do you have wooden blocks? Your weights are non standard Oly size so the bar is lower then it should be.
Lower your hips so you can use your legs more. The higher the hips = more back
--when the weight gets heavier it'll be much heavier to lift with your hips being so high,
Extension looks good on the whole.
Pull faster to get under the bar, you get up well but you sort of 'float' a bit on the way down, you don't attack the bar and get under it as soon as you get up.
Don't bounce at the bottom, once down just get up. This will save you energy when the weight is up.
1st Sn was better then the 2nd one. 2nd is noticeably in front and you loop it away from the body. Watch the video again. 1st is a lot better.
Get some Oly shoes, it'll with balance, your a tad forwards on some of them. Easy to fix.
Looks good mate, get some more videos in.