Pushups, pullups, perhaps having your daughter shoot it and help you come to terms with the issue.......
Sorry had to take advantage of the anonymity of the internet to be a douche and say something that I would never say to another human being if face to face with them. My apologies for the rudeness and the bad joke.
I added a heavy buffer to my LMT and it has a Surefire brake. Its still not a .223 but its not a 1903 Springfield steel butt plate 30-06 either.
I haven't ever played with an adjustable gas system but I think having a means to adjust gas will give you the best way to mechanically reduce recoil. My LMT throws brass a good distance which means reliability but it also means that the bolt is coming back with a lot more velocity than it needs.
and my douchy first sentence was not all douche. Im unsure how you are shooting but if off a bench you cant get all your meat behind the gun to absorb the recoil force. If shooting from the bench you just have to do the best you can.
If you are shooting prone do your best to get the rifle to be joined to the center line of your body. Don't be cocked off to the side or some other position other than directly behind the gun if terrain will allow it. Having a bunch of mass behind the gun helps manage the recoil.