Hey Scott, flipping houses is probably one of my favorite strategies in real estate. I understand the frustration when it comes to competing with other flippers when trying to submit an offer on a property. The world we live in is moving much faster. Correct me if I'm wrong, what it sound like is you have personal relationships with sub contractors (contractors, HVAC techs, plumbers, electricians). If that is the case, seems like a lot of moving pieces to get an accurate rehab numbers and could be what is slowing you down. The investors I have worked with, here is Columbus, OH, have found alot of success with building great relationships with general contractors where you are outsourcing someone to have the sub contractor relationships. You will be able to get your rehab quotes in line much quicker (24 hour or less turn around) so you are able to submit a competitive yet comfortable offer that works for you. As far as permits go, I agree with you. Some people aren't pulling permits, but that is when you start to seeing "lipstick on a pig" finishes or things weren't done properly causing issues for the homeowner later on. I would recommend to continue pulling permits, you don't want to find yourself in a situation where you are flagged by the city and a stop work order is placed on the property.
All and all, I would recommend building relationships with general contractors to save you time by having them come out to the property with you when submitting an offer on the home. Happy Hunting.