Agreed and that is textbook sprag killer. That is also why I think some people have sprag failure and some don't. If cars sticks always, no trouble. Now ask yourself why John Cope makes every one of his valve bodies low band apply, even his non transbrake models. If you bought a billet solid reverse servo, you have what you need to use a low band apply. The key to using that servo is do not use the stock band adjustment setting with that servo. Cope says 2 turns only on a double wrap band. Gets the band released quickly so you don't get bind up on the 1-2 shift but the sprag is held by the band right up till you pull second gear. So even if your car hooks and then spins and re hooks, the band is holding and protecting the sprag to avoid failure.
