Yes, the 9ft ceiling at the Flamingo should not exhibit the extreme amount of slap echo heard at the Alexis Park Zeus Ballroom, with its 17ft ceiling.
We are considering the "Lake Mead I and II", a space with a combined 28x64x9' measurement set. This space can be partitioned at several points. We plan to shorten it to between 32' to 38' in length, allowing us to control reverb time with a reasonable amount of acoustic treatment. The false back wall will be heavily damped and braced.
I am now quite addicted to the live-vs-recorded concept and can't imagine doing a Show without it.