I'm sure that carbonation plays a role, afterall the CO2 coming out of solution is more than likely going to carry things with it. Whether that's going to be perceptible enough to make a difference is anybody's guess. What will be perceptible, is the higher carbonation. More CO2 means carbonic acid which means your beer will have a little bit more 'bite'. In my experience this will be more noticeable than any changes to the hop aroma.
The simplest, probably most effective way, to increase hop aroma are to increase your late addition hops.
All that said, what can it hurt to experiment? If it were me, I'd probably use carbonation tabs. My lhbs sells small tabs such that 4 are required per bottle for 'average' carbonation. I think I'd probably bottle some with 3, some with 4, and some with 5 and then do some tests with my friends. A simple blind tasting would work (so you know which sample is which, but your friends don't) but you could also try a blind triangle test (any given friend gets 3 samples, two are the same, they must tell you which is different).