Try the same test you performed with the damper removed. Cycle the fork upside down a bit before you pull out the damper (so the foam rings / seals are left lubed) and then test it fairly soon after it's removed.I don't see how this can be good. Is this the air spring causing this? If so even with an Avy cart it wouldn't fix this am I correct?
It's nice to isolate these things objectively, as it really could be caused by one of three things: chassis/bushing interface, damper interface/s, and spring interface/s. Establishing which one is causing the problem is difficult over the internet but easy in-person.
Hopefully Fox sorts it out, but if not, try that before spending money on it.