Jason, when the manufacturer talks about 5 grains per pound of draw weight for warrantythey mean a completely finished arrow weight with broadheads, vanes, inserts, and nocks installed.

You shouldbe able to easily achieve this weight, 370 grains in your case, with most carbon arrows on the market today. Many will be able to finish much heavier than this.

Some of the heavier arrows on the market include.....
Carbon Express -terminator XP selectsand Rebel
Easton - ACC, Axis and Axis FMJ
Beman -ICS camo hunter and MFX
Carbon Impact -Titan XLT