Your stem length is determined by more than your height. I am 6ft 1in and i am riding a 58cm Cannondale Synapse and I had to swap out the 110 for a 100 as I felt a bit too stretched out with the 110. The 110 would have been fine 20 years ago but at age 50, when I got the bike (now 56), my flexibility wasn't what it used to be. Even now there are days when feel like I would be more comfortable with a 90 stem. I ride with the stem flipped down and for 99% of the time, I feel best this way. I am assuming that, in a few years' time, I will have to flip my stem up.

If you feel stretched out and have moved your seat forward, a shorter stem may be the answer. Did you get a bike fitting when you bought it?