Originally Posted by
mvnsnd
Can you ride comfortably in the drops for a long time? If so, then it's time to remove one at a time and see how you feel.
Originally Posted by
spdracr39
Flip them stem into the lower position first then when that gets comfortable remove spacers one at a time. Wait to adjust to each position before moving lower.
^^^^ This. Next time you do a long ride, use the drops for as long as you can stand to. If it turns out that you can do most of the ride on the drops, flip the stem down. Lather, rinse, and repeat.
Oh, and don't forget to work on those core muscles.