You're definitely right, the quantization function and its values definitely have an impact on performance.
For 1 bit I think I tried something like -1/+1, -.5/+.5, -.25/+.25, -.333/+.333. and something like -10/+10 -- (and I think a few more). It seemed -.333/+.333 worked the best while +10/-10 did the worst on the google analogy task (getting like 0% right). All this was tuned on 100MB of Wikipedia data.
For 1 bit I think I tried something like -1/+1, -.5/+.5, -.25/+.25, -.333/+.333. and something like -10/+10 -- (and I think a few more). It seemed -.333/+.333 worked the best while +10/-10 did the worst on the google analogy task (getting like 0% right). All this was tuned on 100MB of Wikipedia data.