Open Question: Clip-on aero bars or just stick to the drops on my road bike.

I have an upcoming triathlon (relatively short bike ride). The events are as follows: 750m swim, 40 km bike, 5 km run. I own a full carbon lugged tube to tube road bike that is designed for racing. It has an aggressive more aero position but still no where near the same as some of the tri bikes i've seen. So far I have been training for the cycling event with my local bike club (average roughly 31 - 32 km/hr over a 60km course) without aero bars. I was wondering if I should use my clip-on aero bars for the biking section or should I just stick to using the drops on my road bike. I see so many riders with improper aero positions on their road bikes because, well, road bikes aren't designed with the same geometry as tri-bikes. Any opinions on this? Aerobars (are their useful on road bikes, would I gain any speed) or drops? Thanks! A.