" Light" vs " heavy" is what I think is important - a " heavy" carbon might be the best of all worlds.

I think the 2 or 3 thousand pounds force, for that 0.2 milliseconds, is a reasonable number. Roughly, 60 pounds over 24 inches to accelerate the arrow agrees with 2 or 3 thousand pounds in a half inch to slow down the arrow. I.e., 24 / 0.5 * 60 is about 2 or 3 thousand. Quite impressive, over a ton even with the light arrow (although for only a very short time).