I ran the ADK A51TL LD's with a larger disc (15") with fair amount of success, dating back quite a few years now (8 years ago?)
I've also been entirely successful, and extremely impressed with a CD size disc baffle, and miniature lav omnis.
The mini-disc caused me to abandon the official Jecklin theories, as being way to restrictive.
I've had some good results with baffled cardioid as well, but, haven't experimented to have anything of value to add, other than to say, its worthy of further exploration.
Now that I have 4-channel recording capability, I'm seriously thinking about running a pair of sub-cards with a minimal amount of off-axis toe-out, paired with a pair of omnis on the same disc. The reason for the minimally off-axis sub-cards would be to reach deeper into the typical chamber ensembles on stage U configuration.
Or maybe a three mic set up with a card/sub-card at 0º above or below the disc, mixed with the flanking omnis.
I suggested the tighter mic spreaders, because I think you'll really like the effect of the more isolated mics.