I’m not sure if this is absolutely correct but….
If a frame is designed around an air shock, it means that the rate of progressiveness within the frame mechanics will be tuned to work with an inherently rising rate of the air spring, i.e. it will not be as mechanically progressive as say a DH bike designed to work with a coil because the air spring is already making it harder to compress as you move through the stroke.
This is all about the amount of leverage the suspension arm is creating and therefore the amount of compressive force the shock is ‘seeing’. Progressive means it gets harder to compress, which is what most people want, but it’s the rate of progression that is key here.
Coil springs are linear in the force needed to compress them at all points in their cycle, so frames designed around coils have more progression built into the kinematics to make it harder to compress the shock deep in the travel. The leverage ratio falls, the force the shock sees decreases, it gets harder to compress.
If you frame is designed specifically for an air can, then with a coil, you may be bottoming out too easily, because the rate of progression will be assuming the shock is getting harder to compress at the end than is actually happening.
But since you’re running a CCDB, that is easily fixed, you just need to add more high speed compression damping.
The Orange Five is, I think, inherently regressive in its design, i.e. at the end of the stroke it’s actually getting easier to compress (more mechanical leverage) which is one of the reasons why the CCDB works so well on that frame as the HSC can be tuned to make it nicely progressive.