One thing I can see that would help you out - easily... Check out the Gold Tip Ultralight 400. 7.4 gpi, which is a good bit lighter than your Bemans at 10.4 gpi, and it's still spined stiff enough for your draw weight/length. Cash money.

On a 28" arrow, that cuts your shaft weight down from 291.2 to 207.2.

The rule of thumb is five grains per pound of draw weight. So, 60# x 5 = 300 grains. That's where you'll wanna be, if you want the most speed possible out of your bow. So, at 60#,you'll want to be as close to 300 grains as you can get.

A Gold Tip Ultralight 400 with a 100 grain head would put you right around 300 grains.

Your bow will be a little louder, so you might want to plug an STS unit on there to take the twang out of the string. I'd say with a newSTS on there, and a bump down to near 300 grains, you'll be looking at a faster, quieter setup than what you started with.

Just my .02