Your Razortec is just like my Havoctec that I just sold. I would say stick with the 5575 with your current set-up...that is what I used with my Havoctec...and if I remember the Razor was just the the Havoctec wasn't it.???..I think the razor was the upgrade to it..

If you want to gain a tad more speed I think you could goto a Gold tip ultra light 400 with a 100gr. head....If you go with a lighter head like a 80 gr. head you would want a different spline arrow like a gold tip Ultra Light 500.