Hi mate - I bought a pair direct from Tim Flooks at TF and he said that the spring rates on the Revelations were set quite soft for their rating. Consequently, at 104kg, he said I absolutely needed the extra firm springs. My riding style is fast and aggresive but the terrain where I ride is relatively tame (North Downs).
You could either take this as an indication that the firm springs are probably just right for you or you could always give him a call and see what he says. Either way, changing the spring would be a very easy job and TF could supply you with the right one.
One idea that could work well is if having bought them, you send them off to TF and have him Push tune them for you. As well as giving them a complete service, you'd probably find they change the spring rate for you as part of the overal tuning. That does cost £140 mind. I had mine Push tuned and can certainly recommend it - part of me wishes I hadn't sold my Revelations on, as they were one of the best performing forks I've ever had and easily the best value for money (the Push tuning was inlcuded when I bought the fork so it was a lot less than £140!)