Interesting, I never though flop would cause much concern on a short wheelbase recumbent.
I normally ride a Vision R40 or SatRDay as short wheelbase recumbents,
I guess I have experienced the "flop" in tight turns, but never thought about it as a significant issue.

I have been meaning to complete my titanium recumbent build for the last couple of years, but it's difficult to find a replacement fork for 1" steertube with disc brake mount.
I would like to go to a smaller front wheel than 700c, wouldn't mind a smaller rear wheel, too.