If you were to analyse your shooting technique you may find that you do things very differently at new/dif. clubs, i don't know what causes this, nerves, etc.....The best advise I can give is to develop a mental checklist when you mount your gun, this should be to remember to picture things the same, mount the gun the same, foot placement, etc. Develop this when you are at your home range and shooting good, and remember to go through the mental checklist everytime you mount the gun to shoot, no matter what trap range you're at. Another checklist item may be your timing, have it fixed in your mind from the home range, and go through it mentally each time before you shoot. Too Cerebral??? Yeah I know, I don't have a good grasp on it either!!!!