justabuickv6
The absolute maximum time the injector can fire is from the time the intake valve opens until the next time that same valve opens 2 crank revolutions later That time, in milliseconds, from intake valve opening to intake valve opening (2 crank revolutions) is = 60,000 x 2/rpm.
At 6000 rpm you can only have a maximum of 20 ms. The higher the revs, the less time there is for the injector to fire.
The % pw is what the computer is commanding divided by the maximum possible above. So if at 6000 rpm the ecm is commanding 15 ms, you've got 15/20 = 75% and you're okay, but if it is commanding 25 ms (start pushing over 5000 rpm) then 25/20 = 125% and you really need bigger injectors.
Yes, you are on the edge and pushing it. IMHO, if you are satisfied with your times and do not wish to go faster, and will rarely be going to the track... you could live with what you have. But... if you want to be safe, knowing that you are going to push it, step up to larger injectors. (It's cheaper that head gaskets and bearings ; )
Paul