I am new to LG110 and I don't shoot FT. But what I experienced with my LG110 Hunting 40j last week is quite known and obvious. It was shooting JSB 15.9g's very good. One day I wanted to tweak it and increased the power. Next morning, I was very frustrated since getting below groups. I cleaned the barrel, checked the screws, scope etc. But it was still shooting like shotgun. Than I shot some 18g JSB's and voila. Accuracy was back again.
so finding the right pellet can be the cure.