I'm looking to squeeze a little more performance out of my rear shock on my trailbike. I know this isn't the trailbike forum, but there are more suspension gurus here than anywhere else. Right now I have a Float R on my Cannondale Rush. To my knowledge the bike has a regressive shock rate that makes it perfect for a small volume air shock. Rather than sending my R off to PUSH and seeing what they can do, I've been looking at getting an RP23 to have some more adjustability. The problem is that most of them are coming with HV air sleeves. I'm kind of stuck with PUSH as the Rush has a weird shock stroke (1.75") and I don't inherently trust that I can just slap a spacer on any air shock and be good to go. If I get a HV air can, is there anything I can do to make it more progressive so the bike doesn't blow through it's small amount of travel? Is there any advantage to a spacer and HV air can vs. small volume air can? Alternatively, can I swap my LV Float R air can and the HV RP23 air can, if they are both coming on 7.5" shocks?