AMO DOES NOT RECCOMEND 6 grains per pound FOR EVERYONE.It varies with poundage and draw length.
You need to go to
www.bowjackson.com and check out the chart.You may be surprised at just how light some of their minimum suggestions are.
I just checked my setup on the chart and with a 385 grain hunting arrow,I am still 45 grains heavier than the MINIMUM reccomended arrow weight.