Sounds like you need to adjust the nut gripping the bars; millions of other riders don't seem to have this problem. Seriously, though, if you can't sprint in the drops, and that's how you want to ride, your bike doesn't fit. An adjustable might help you find what fits, but usually after that people ditch them for something lighter and less lame.

Also, don't pay $50 for an adjustable stem, just walk into a shop and give them $10 for one they took off of a hybrid or something. Of course, if it's a good shop they'll help you dial in your fit and then sell you the stem you actually need.