Question about AO scopes

[Methuselah]

well this is going to be airgunproshop's problem now. The gun is firing very slow so I've asked them to address the trigger issue while dealing with the low air issue.

Ah ha!   

Sounds like you got your chrony ... either the ram they gassed up leaked, or more likely when they put it back in they cut the seal and your vibration was the piston slamming the end of your cylinder.

Anyway, that's what I'd be suspecting at this point --- good it will be their responsibility to deal with, but I hope they will tell you what they have to do to fix it!