Steve,
Welcome.
No, most likely it's not you. In addition to the bad trigger, the gun needs some break in time and will not be as consistant as it can be while it's wearing-in.
Plus, if you see smoke down the barrel when you've just fired it, it is still burning off whatever that oil is they leave in it. All inside my gun it was still well coated with thin, black oil after a few hundred pellets fired.
Yes, the Tuna trigger will make a BIG differance toward consistancy, but the gun still needs to wear in and burn off any excess oil.
Paul.