Adjustable stems are OK if you are trying to figure out where you want the bars located. They allow you to try different things. But once you know what you want, it is cleaner to get a stem with the correct length and rise to give you the desired location. Stems come in a wide variety of lengths and angles. Just look at where the bars are located now and where you want them to be. Figure out what stem length and angle it will take to get you there. Buy it and install it. If the LBS won't help with that, you are at the wrong LBS.