I don't understand the problem, why don't you just choose a scale yourself?
My player models are usually ~ 0.5 - 1.5 big grid boxes (in WED) in height (that is 128 quants for each box). There is not really such thing as a wrong scale, just keep it above a certain value (I would not go below ~32 quants for a meter) because of inaccuracies of "var" and below a high value (one meter should be less than ~1024 quants - just a guess) to avoid overflow in calculations.