since these sensors are able to accept 6v power would this increase range? (linearity is already OK and centering is also, but I'm kinda curious)
I'm not really sure what would happen. Different things might happen if you powered your A/D circuit with 6V as well, compared to just the sensor. I think it would depend on the design of the A/D circuit, and how well the A/D would work with something that can exceed its own supply voltage.