First, let me say I believe an archer's accuracy is determined by their consistency. Do the same thing every time, and odds are one will be accurate. My point is, if this method works for you or 100 others, great. I would recommend one keep using it.
That said, IMO, this excessive pull through in many cases leads to an archer's bow arm jumping as well...and I personally don't think about "pulling through. Instead of actively "letting go," I let the string rip out of my release. I feel this helps me keep my bow arm steady and my drawing hand only goes back a tiny bit upon release.