I’ve been working on my form and I realized my timing is off…

I’ve been working on jumping recently and I realized timing is really important and to keep the legs strong till the rear wheel leaves. I

I’m wondering how the form is (I tried standing up and extending my legs in this jump)

I figured my upper body needs some work I need to use my arms aswell but I ended up pushing my front wheel down here.

My main issue I want to get rid of is not being so stiff in the air