PA257 - I believe that if you are at 70#, you arrows are too light.

I believe most manufactures require to stay at 6 grains per pound for their warranties. You would need to be shooting an arrow around 420 grains not 305gr.

I'd go to the website I posted and plug your numbers in to see what arrows it recommends. As for carbons - I've had good success w/ Beman ICS-H.