In 2013, the race was produced by Setup Events and took place in September. Benji Jones, who was with Setup Events, left to form Jones Racing Company in late 2013 and took several events with him, including the Carolina Half. For 2014, the race was moved to May 4th, which worked out better for the planners and town.
The swim was 100% the same but the bike and run courses were modified slightly. In 2013 the bike course featured too many turns and short legs; this was corrected for the 2014 event resulting in a much faster course. The run course originally was a one lap out and back which included the cross country course at Davidson College. The 2014 course was changed to mainly streets and paved greenways but still featured some pretty tough hills.
In 2013, I did not strip my wetsuit off fully until I got to my bike, which was a mistake because the swim to bike run is about a quarter-mile! So in 2014 I made sure to take my suit off completely at the water exit. There is a large concrete driveway at the swim exit so plenty of room to strip. So the best way to see if I improved at all from 2013 to 2014 is to look at both my swim plus T1 times together:
2013: 42:53 vs 2014: 44:01
So I actually lost 1:08 in the 2014 race which makes sense because it felt a little slower. I didn't draft as many people as I did in 2013. I also struggled to get my suit off...did not bring any cooking spray!
In conclusion, most of the difference was on the bike and probably due to the more straight course. However, I think my run strength has also improved. So, I'd attribute half of the better time to the course and take credit for the other half :)