Can some one explain this, I'm shooting 27" carbon express maxima hunters 250 and 350s with 100 grain slick trick heads out of a mathews xt 70 lb 26" drawand they are dead on at 20 to 40 yards, but when I install lumenocks or archers flame nocks they cork screw and hit 4" left,and when I put the others back inthere dead on. Do you think my foc is off and maybe I should go with a heavier head.I don't have any 125s this is why I"m asking. Thanks for any info