Well, at 60yrs old and having hunted longer than you have lived, I'm well aware of bullets being spewed all over the target is poor marksmanship and/or a gun kicking your butt. Apparently just 3 yrs. of missing hasn't taught you too much and with that chip on your shoulder, why ask for advice, if you can't take the answers that just may be helpful to you. Sorry I ruffled your feathers, but I'm not the one having the problems and thought you were intelligent enough to understand the meaning of my reply to your problem.
I hunt the big beanfields of SC, with a .270 and 300+yd. shots are normal for us who hunt them, so I'm experienced both in years as well as distance; difference being, I'm not the one missing the shot!
Since you took one part of the advice out of context, maybe you'll learn something from the other as well as this reply.
I have no further advice for you, but Luck with the misses....