You are lucky i use a laptop and can turn it on its side.
Figure out a way to get all your video rotated. I don't care how...but its necessary :P
Also, put all of your videos into one big video that we can navigate through, if possible. I find this makes it easier to go through your lifts. Plus i can get a glass of milk or something while the whole file loads instead of having to babysit downloads on my shitty wireless connection.
1) Your squat videos are useless...
Firstly, the weights you are using are so big that we can't see anything. Also, its very dark. Thirdly, the angle sucks. Get the camera behind you at about a 45* angle so we can notice things like foot position, back position, hips position (like going past parallel) and head positions.
Only thing i can tell u based on those videos is that you are shooting your head straight up and thats no good. While loading the spine you're creating a crazy exaggerated cervical arc that is going to lead to problems. Some people say head neutral, other say looking ahead but you will be hard pressed to find someone who says look straight up.
2) Get weightlifting shoes. You will thank me later.
3) Head back more on the press. The bar is traveling forward. YOu can handle this on 115. Any more weight it will (a) throw you off balance and (b) make you fail. You want the bar path to be straight up. Pull your head back to achieve this.
4) On the DL Your shoulders are over the bar when you want your scaps to be. Make sure you move your body forward such that your SCAPS, not SHOULDERS are over the bar. This implies that the bar is not over your mid-foot and as you go heavier will be harder to achieve. Also, for god sakes, look down. Keep neutral spine...at the very worst look forward...not sure what you're doing by looking up like that.
5) I know less about the snatch than the other lifts but i can tell you for sure starting with a rounded back is no good. Probably because you are using little plates here...As you approach the normal height, you do not get your back into proper position as it stays rounded the whole way through until your extension.