Hate to be the bringer of bad tidings, but the arrows mentioned above will NOT be faster than what you now have. Each is approximately 1 gr/inch heavier than you are now shooting. The end result should be about a 10 fps loss in initial velocity.

The GT 5575 you are now shooting is about as light a spine (.400) that you can shoot at that length and weight. If you want a lighter arrow to gain more speed you could look at the GT Ultralite series. O their website click on Products, then Build Your Own Arrow. The Ultralite series is under the Target Arrow link. Work up your specs and see what you come up with. Personally I would work something up with the UL 300 or the UL 22 series. These should spine a little better for you.

There are lots of ways to get more speed. Consider that everything on the string is like having weight on an arrow. Try cleaning off the string of unneccessary accessories. Shorten the center serving to about 3". Got a tube-type peep? This costs you as much as 8 fps. Keep string silencers close to the cams to gain more. There are lots of little tricks, but the arrows mentioned are not part of it.