Why wouldn't they be able to jump out after blocked LP bolt? Unless you mean something different.
Yea jump back works, but it and true reversals are the only things that work. That's why I keep track of their behavior throughout the match. Very very rarely will people jump back after a blocked LP bolt. they tend to have frame advantage and rarely expect a super outside of a combo. So blocking moves makes them think they're safe.
It's obviously not a 100% conversion rate like in a combo, but in my experience it's close to 80% and you get the benefit of full damage without the scale down.