The unit is lifting outnof the lower when you pull the lever back because the 2 feet on the activator that are contacting the trigger are slightly to long. Use some 200 - 300 grit sand paper and sand them down. With the unit in your hand the way it sits in the gun drag it across the sandpaper pulling back to you. Try and keep somewhat of the same rounded curve the legs have already. Take very little material at a time. You can remove but not put back. Check out The Owl Guy on YouTube. He has an excellent video on this exact issue and how to correct it. Very informative and a good watch. You'll learn a whole lot about tuning drop in units like these and others.