Form check straddle plance SE4

Hi guys i'm trying to know if i'm doing it fine , I'm on week 6 so 4x18s are my numbers. I'm posting a video of each of the sets: 

There you go, thanks.

Too high. Lean forward more and lower.

Alright, legs are fine? lower back needs to be straight or a little rounded on this one? Also, the 4th one was the best,right?

In addition to the other comments, too much movement. This is supposed to be a non-moving static hold!

Yours in Fitness,

Coach Sommer

I'm going back to SE3. Thank you all.

I think the first looked ok, dont jump so much and try to lean in to it
easy to say...