I'd start with a .500 spine, honestly. You are only getting maybe 45-46lbs at that draw. I like at least .75 of an inch past the edge of the riser, but more is probably better in case you get pumped and overdraw the bow, bringing the broadhead into your finger or cramming it into the riser. That will break your concentration, for sure! If you absoulutely don't want to buy arrows, you can buy the 100 grain brass inserts and then add point weight till it flies well, but it might take quite a bit to get there, and the trajectory might not please you, depending on how far you like to shoot. The heavier arrow will make the bow very quiet, though, and will tend to penetrate better, too, so there's that. Good luck.