Richard --
In my earlier post, I mentioned that the units you cited were exceptional in terms of arms and equipment. Once effects of the blockade set in, and Confederate were obliged to depend on home maufacture, captures and occasional windfalls from blockade runners, supplies of modern weaponry limited the effectiveness of Southern cavalry. From mid-1863 forward, Confederate cavalrymen came under the heel (or rather the saber) of his Federal counterpart.