i was under the impression that lifting boards worked best when their section was an aero-foil style asymmetrical wing type

ie not symmetrical

somewhere on SA is a pic of the end bmwo's banana boards that showed a fat, high-lift, wing section

your build description for curved boards doesn't seem to mention a lifting section...???

straight boards can be angled to provide lift, but apparently they don't work well across a broad range of speeds so aren't used much

symmetrical curved boards aren't going to provide any lift are they???