deck squat SLS/PE1

I m wondering if when coming down to the squat before rolling back , does one have to be able to balance in that position ( or have the buttocks touching the support if using one ) .    I don't have this balance now and am compensating by kind of throwing myself back a bit. 

Also, how wide apart should the feet be ?

Thanks very much 

I appreciate any feedback 

Shoulder width or less is fine on width. 

You don't need to show a pause, but the term throwing yourself back shouldn't come up in this element. Controlled descent

Not feet together?