Dear Stringreen,
After the cartridge is well run in, what you are proposing (to use a similar car analogy) is that my car can have a square tyre on one front wheel and a circular one on the other whilst expecting it to steer, handle and perform properly?
Do I need to fit a "square tyre" to my car to prove this or is common sense sufficient?
In my rig, if I were to play the 12db track with my current A/S setting, the R channel would be buzzing slightly. This is because I optimised by ear and used lower A/S. IMO, contrary to some suggestions, I don't consider that the ideal setting is a million miles away from the "balanced setting" on the 12db track so it is an acceptable starting point (as far as I'm concerned).
(BTW, I have actually tried low > zero A/S approx 1000 LPs ago on this Phantom II/Delos combination)