On the contrary, it sounds like you have some pretty good reason to like and trust that LBS.

Bikes, unlike cars for example, are constructed out of parts made by a variety of makers. Even if there are industry standards so that parts can play together, it often takes a little bit of adjusting to get it all dialed in. If I bought a brand-new Ford and it seemed buggy, then I might be concerned even after the fix. But with a bike, it is not unusual at all. So, ride with confidence. And, even if the bike was perfect out of the gate, you might still expect cables to stretch a bit and spokes to settle in a bit. So, even if you have to tweak it again before long, don't be surprised.

jim