The fastest measured "IBO" set up I have seen through a chrono is my new Airborne 82.
I put the 30" mods in (measured a hair UNDER, like 1/32 under 30") Set the draw weight to 70.3# on my digital scale and shot my 352 GT X-cutters through the chrono at 347fps.
That's with just a brass nock on the string and I didn't do anything special to the timing or change strings etc.
I heard of one Airborne 82 after some fine tuning doing 354fps at 30"/70#

Anyone who quotes a speed, I don't wanna hear it unless you took the time to verify the actual measurements.....AMO draw length, draw weight and arrow weight at 5grs /lb of draw weight. LOL