I love shooting small shot with one per fork, of course using my MAGNETIC POUCHES, that can be found in the vendor section.
I shoot the 2040 and 1745. To date mostly the yellow. Though I recently purchased some black and red. Can't confidently give an opinion on the black and red but I imagine it to be as you said.
I cut my lengths to 8 1/2 inches (21.6cm) and after tying off there is 7 7/8 (20cm) effective tube to stretch.
Draw is 32 inches.(81.3 cm) The 2040 I usually will shorten the effective length to get more zip.
When I first used the above I didn't shoot 3/8 (9.5mm) steel, though it flies good. If I were to shoot 3/8 on a regular basis I might shorten the band a bit if I found I wanted more speed.