Just bought some Revelation Dual Airs secondhand. After coming from Fox forks which you could setup really fast and sensitive, my Revelations don’t seem so sensitive, smooth or plush. I can’t get them to work that fast, even with zero damping and lots of negative air in.

Would a service improve things, or am I expecting too much from these forks?

After changing oil in my Reba there was a difference in sensitivity so an oil change might improve things, also depends what oil is inside. Try 5wt for quicker rebound, fiddle more with compression and air settings. Took me couple of rides to set my Reba the way I like it.

download the service videos from sram on youtube, its easy, 5wt and 15wt oil from CRC its strightforward and may make a difference.