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Yeah, part of the fun is experimenting. :-)
Seriously, though, see if your receiver lets you change the crossover setting. It might be hard-wired at 80hz, or have adjustments. If you know your main speakers can produce bass down to, say 50hz, then if you set the crossover point to 60hz, then, IMHO, there's no reason not to set the speaker to small and send just the low bass to the sub. In other words, you want to crossover as low as your "small" speakers will allow.
Unfortunately, I have a center that rolls off around 90, so I think I settled on leaving the fronts at "large" and the center at small.
As for the sub, I have to turn it down, for the wife. This complicates the balancing act. ;-) Seriously, if you're just turning down a sub that is set to reproduce 60hz frequencies and below, you can get away with turning it down without seriously impacting the sound. If your crossover is higher (especially if it's at 100!) and you have to turn it down, you're in trouble! But by having my mains at "large", I'm still getting some bass, at least, even if I turn down the sub. (However, most bass probably is in the center, at least when listening to a stereo source.)
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