Either your trigger return spring is set too light, not enough sear engaugement, or a combination of both. FSR, or firing on safety release usually happens after pulling the trigger when the safety was on. Usually the trigger doesn't return all the way from the return spring screw being backed off too far. I'll take a look at my dads. I really haven't looked at his trigger closely, they are adjustable aren't they?
Adjusting my Savage Striker trigger has been pretty fruitless, I'm sure it's at 5lbs+. If I got lower, no matter what I do it isn't reliable when the bolt is closed "down" hard, it just fires. Too many moving parts in it, but I've seen another trigger for it that they claim will go to 1.5 lbs, yeah, we'll see about that one, this one sure isn't going to work.
Here's some pics of the AR-30 (southpaw now) and a link to some more close ups.
Click on the drop down menu and there's 7 pix below the AR-30 1 pic. http://www.imagestation.com/album/?id=4289203001
1.3" 10 shot group at 200 yards with 190 SMK's yesterday, damn it shoots good!