Without having any specs of your setup other than the peak weight it's not really accurate to make a suggestion. I will say this. The XT's are as good or better than any of the Easton all carbon arrows if you read the advertised specs. As for the FMJ's, I really haven't any expereience with them except to tell you they will be substantially heavier than your XT's, thus slower speed.

I'll give you a hint if you are having flight problems. Turn the bow down to 65# and see how much better they shoot, If you feel you must shoot 70# then you'd be better served with the XT 7595.

As for pure quality I can only repeat what mobow said and suggest ACC's, regardless of price. They are as good an arrow as a bowhunter can get for his suited purpose. When comparing top-of-the-line all carbons against ACC's the cost difference is minimal.