We feel that the smaller knob is quite good for what it does. Our primary goal is to make it less "bumpable". You will have no trouble adjusting, but then, you will also have no trouble with it adjusting itself as you move -- a serious problem with larger knobs.
Regarding the rubber bands, I was just curious to see what response we'd get to a claim that we can offer both kinds... IMHO, offering both is borderline madness, but I was curious....
I think we should offer the raised one, choose the stronger option with more longevity and be done with it.
But.... the rubber band controversy will go down as a definite highlight in the history of crowd sourcing. A lesson learned for your humble servant :)