The bike shop with the best prices isn't going to have the best mechanics. Nor is the bike shop with the best mechanics going to have the best prices. You need to choose which shop to go to based on what you need right then. Best price or best service. Your situation is slightly different since you are in the warranty/new bike adjustment period. Still, for the money you've spent on gas going back and forth, you could already have bought a minimal set of tools and done all those adjustments yourself in 5 mins.
I've bought bikes at Performance and learned not to take them there for service. I've also learned how to service my bikes myself over the past 5 years or so. It's not that hard, it's just a bike. IMO Performance is for people who know what they want and know how to do it. It's not so great for the inexperienced.
BTW, I've also had issues at the "Neiman Marcus" of bike shops too.