>more speed provides more stability for the rocket
This is because the rockets are launched smoothbore, then small fins pop out to spin the rocket in flight and give it some gyroscopic stability. The problem here is that during the initial period before the rocket is spun fully, the fins only produce WOBBLING in the air, which greatly harms accuracy.
tl;dr fin limitations cause rockets to suffer a lot from accuracy problems.
One way to cut on the wobble is to increase the speed of the aircraft, which shortens the period during which the rocket isn't spinning. But the REAL solution is to do what the Canadians did, internalize the fins into the rocket exhaust, which completely removes the wobble problem.
>Unguided rockets are normally spin stabilized, like a rifle bullet. The spin is imparted by small fins at the rear of the rocket body that flip out into the airstream once the rocket leaves its launch tube. The fins take a short time to open, and more time to start the rocket spinning. During this period the rockets can drift significantly from their original aim point. The CRV7 solved this problem by adding small vanes projecting into the rocket exhaust to start the rocket spinning even before it left the launch tube, greatly increasing accuracy. A salvo of CRV7's will impact the target area in one-third the footprint of older designs.
The CRV7 is the most accurate unguided aircraft rocket in the world.
>The weapon was originally quoted to have a dispersion of 4 milliradians, but testing with the CF-18 Hornet demonstrated it was even lower, at 3 milliradians. This is considerably better than the autocannon that arm most aircraft; the widely used M61 Vulcan is rated at 8 milliradians, while the much larger and considerably heavier GAU-8 is rated at 5 milliradians.
A CRV7 is just as accurate when launched from a ground vehicle, pic related it's actually as accurate as a 105mm light gun.