Would it be safe to say the next step would be to try the seating depth in the middle of these two loads?
http://photobucket.com/user/243Wilson/media/15268416270281001938900_zps9zhdpemg.jpg.html
http://photobucket.com/user/243Wilson/media/1526841661058745161802_zpsnfyvudbi.jpg.html
What primer are you using? My groups looked like your last pic then I went to CCI 450 made a big difference.
I get some two group stuff like the pic above if I let my front rest bag get loose or I bang the rifle back forward and hit the stop