No, power only goes up as the revs rise as you spin the blower faster, smaller pulley= blower spins faster at lower rpm. What you need to calculate is how fast can you spin your blower. Efficiency is due to parasitic losses that supercharger creates. Sorry phone ran out of battery.
Off you go on vortechs website you can calculate the speed you are spinning your blower, I.e. aim for 53k so that might mean lower rev limit but change to smaller pulley or change cog setup or crank pulley size etc.