Jerseyboy, try hardwood shafts. They'll get the weight up for you. POC is one of the lightest shaft species.
I generally shoot arrows in the 600-650 grain range with a variety of bows and draw weights. for me, the weight of the arrow is not nearly as important as getting the spine matched to my bow. Arrows of all weights perform better when the spine is perfect for the setup. That's where you get the maximum efficiency from the bow, and where the trajectory will be the flattest. I don't have to compensate for draw weight or arrow weight within reason as long as my arrows are right for the bow.