Hatsan AT44-10QE Accuracy

I posted a long, long question the other day about accuracy with my Hatsan AT44-10 .25 cal. being so erratic. I got a hold of Hatsan and did everything they suggested to improve accuracy. This tightened up the groups quite a bit, but I found the accuracy to still be unsatisfactory. I tried JBS 25.4, 33.95 and H&N 27 and 30 grain pellets. Nothing impressed me at all, not even close. As a last resort I bought some H&N field target trophy pellets in 19.91 grain. To my surprise, my first group was spectacular! I dialed in the scope to hit exactly where I'm aiming and now I am shooting some awesome groups...still at only 20 yds. but the gun is shooting as I thought it should. Everybody and I mean everybody, suggested I shoot heavy pellets out of this gun. I'm getting an average of about 960-965fps and outstanding accuracy and I haven't even adjusted the power at all...don't plan to either. I'm fine with 960-965fps in 25cal. Just wanted to put it out there... the Hatsan AT44 can shoot great with lighter pellets! Thank you to everyone that helped with their suggestions in regards to the first post. Have a great weekend. Kevin