1.shift gears
2. spin faster
3. **********
4. Profit

seriously, your issue seems pretty easy to fix. Also i like my 39 because when im in a flat area i can spin all day going 40kph. its pretty funny to be in the middle of a paceline just going along in your 39/14 (as you know you dont want to go to the 13 or the 12, too much chain rub). (just to let you know that was what most of my training at my winter training camp was. Spinning all day wth a gorup just working in miles).