If that is the case, order a new trigger assembly. After it arrives and you're sure it fits and works, then have at the old one. You can try adjusting the parts you think would lighten the trigger. Being careful of course not to over lighten. If you good something up, then its easy to take out the broken part and replace it with the new one.
I remember a in line rifle I got from Traditions one year. Purchased it through Sportsman's Guide. I think it was called an E something or other. Cleaned it up, got it all set to shoot, and discovered it was "self firing." Yes, I had it out on the range, loaded it, it had a hammer striker ignition, cocked it, was bringing it up to put in the shooting vice, no finger on the trigger, and BOOM! it went off. I was shocked. So I put a new primer in it, no load, cocked it, and BOOM! it goes off again. Needless to say we went in the house, cleaned it and boxed it up and sent it back to Sportsman's Guide. They wanted to send me a new one but I told them no thanks.
In fact I had sworn off inline rifles because of that. But the girlfriend got me a CVA Staghorn Magnum for Christmas that year. So I got that set to shoot. And that was just an awesome loading and shooting rifle. I finally sold it real cheap to a fellow that needed a GOOD rifle. And he was tickled to death with it. He still hunts with it.