Quote from this site and the HSS...

"Both feet should be FLAT on the ground at impact. There is some leeway with the trail foot but not much"...

"Be sure to keep the rear heel down 'til impact.
Keep your head over the rear knee and very still."

For me delaying any right toe finish keeps you from coming out of the shot prematurely. A hook or pull will happen if you do...

I come in peace...