I switched to carbons a month ago. Bought GT 5575' s they shot great and I loved them shooting at 62#. Cranked my bow all the way up to 70# and the world fell apart. I have the same length of arrows as you, but draw 29" . I could not get the 5575' s to tune for crap at 70#, but they shot like a dream at 62#.

Last week I went out and bought 6 new 7595' s and man what a difference at 70#. I just got in from messing around at 60 yards. I shot numerous groups in the 4" range and every single group stayed on my black painted paper plate. I cannot do better than this with aluminums.

I' m 99% sure you are underspined with those arrows.