On another note, have you removed the epoxy plug from the butt stock? You can lighten the rifle up another 5 or 6 ozs removing the big chunk of epoxy in the buttstock and filling it up with spray foam. I also knocked 2" off the barrel and replaced the bolt handle with a titanium. If I recall...
I have noticed this too if the barrel gets too warm, which, given the super light/thin profile, doesn't take long. Under 5 shots though and it will clover leaf.
Have they changed the frame and shoulder straps at all? I found the K2 very snug and narrow. I'm about 5'11"/6' and 210lbs. Some say I have broader shoulders. Just could never get the K2 frame to fit me right compared to my Kifaru. Otherwise I liked the bags.