I recommend you NOT flip that stem as it has too high of an angle.

Instead, buy a cheap stem from your local LBS, and choose one that will give you a -7 degree angle. This will fit your semi-compact frame perfectly. May as well have the LBS install it—probably will take them 5 minutes and may charge you nothing if you buy that new stem from them.

Lowering your riding position will make you more aero and also make easier to stand and pedal (easier on your arms). Your bike will also look sleeker.