Better cranks is the only thing I'd suggest. Proper 144 BCD jobs. For what the RD2 costs you're better off with the On-One external bearing track cranks.
I already own some RD2's you see, quite happy with them, i could always upgrade them later, also believe i can find a better chain ring in 144bcd?
I already own some RD2's you see, quite happy with them, i could always upgrade them later, also believe i can find a better chain ring in 144bcd?