GE/Jasco Dimmers not able to dim?

Ok just looked at Big switch. What it does do is initiate the action, but only in a on A /then on B at 30%

I was hoping for something more dynamic. Like on A 40% / on B 30% (maybe to compensate for a different total lumens of the bulb). Then turn A up to 80% / up B to 60%. Maybe some ratio? If not a ratio, at least mirroring changes in dimming?