John, what size is your air line and/or fittings? A 3/4 or 1" impact is about worthless if it's being fed through a 1/4" fitting. I have a 3/4" IR that I use on the F7, and a dedicated port on my air system was changed out to 3/8 high flow fittings. These don't have the automatic air shutoff when you release the hose (causes more air restriction), so a gate valve was added upstream to be able to shut things down prior to disconnecting hoses. This increase in fitting size will make night and day difference in the torque you have available with any impact gun.
