just do all the stuff listed in FM-1 and worrying about D-0 will be a thing if the past. 25 minute turns will go away too. The only reason their schedules work is because regional Captains ignore tons of crap in the book. Nobody wants to be the only guy following policy because places like Envoy will eventually target you. Never-the-less, they schedule they way they do because the pilots allow it.

The one thing I’ve noticed about my shop is that if it’s policy in the book, we do it, even if we’re late. We have a 1 hour show time, and the quickest turn I’ve seen scheduled ever was 45 minutes... and more than one leg a day is exceptionally rare. Normally it’s 1 to 1.5 hours to turn it.

Get out of the regionals at your first opportunity.
Atlas, Southern, Frontier, ABX. While you’re applying, either become a check airman, or an assistant chief pilot, or anything that will make your resume stand out. Then Network like hell.