That method works fine. Just put them in the saved game jersey folder and you don't even need to go in and hit Find, it pulls it automatically.
There isn't any need for the "jerseys_logo_etc.png" file with this method aside from jersey colors being set wrong, but the full uniform will overwrite that anyway. Hats should work as well by just copying them over into the saved game folder, but logos don't work like that since you can't set team and text colors unless they are in the universal one.
Whew...looks like we finally figured all that out.
