I progressed from the lower level Rapture's, to the K15's, and finally top level Raptures. Same reason as you, for the slower meter speed. Great set of clubs and I'd recommend them to anyone. I always found that I was hitting about 5 yrs avg further rather than shorter. You didn't mention what balls you use but I use the Callaway S's. They will give you a bit more yardage and slow the meter a bit as well.
Now I'm getting close to moving up to the Master tier so I know I'm going to need a bit more distance off the tee and am working with the R9 driver. Will take me a little time to get the meter down but I'm confident its going to improve my game when I do.
Good luck, have fun, hit well!
Lashe