Bushings need lube to work so I’m not sure if the lowers are supposed to be dry.Good to hear they are working well I have found the three I've had to just work with no fuss which is what I want. Surprised about the grease in the air spring mine have always been liberally coated but there is always going to be variation. Also I think they are always dry lowers as there is no bath oil for the damper or air spring. Like you I throw 5ml of fox 20 in both for good measure but from factory I think they are supposed to be dry.
Also how did you test that the damper was bled properly, or was it just that it felt good on the trails?
Cycling the damper with the lowers off gives a reasonable indication if there’s any air in there.