Nick
If my comments would argue against asymmetry, then that was certainly not the purpose, asymmetry has been the way forward. Yes this produce more lift, and so much more that there is a lot of margin to work with if needed for to compensate possible side-effects.
My statement is a pure 'engineers' reaction. When going from the symmetry to asymmetry some new 'disturbance modes' may be triggered which have to be taken care off if they come in the neighbourhood of some resonance frequencies. As an engineer, permit me to reason as a pilot: better to be safe then sorry. Apparently torsional resonances do not occur, or at least they are far less important then vortices, drag divergence etc..
delta3.