Two ways to make more power with a CENTRIFUGAL SUPERCHARGER
 

I drew this graph for Nordic Heat, but I thought I should share it here.

This is a simple compressor map. Your current supercharger/intercooler/engine setup is respresented by the curve labelled "System 1". That resistance curve represents everything the compressor sees as restriction and it crosses the compressor "RPM 1" line at the black dot producing discharge pressure P1 and air flow Q1 and your current HP. Discharge pressure is the pressure measured immediately after the blower and is not the same as "boost" which is the pressure measured in the intake manifold.

The first typical way to increase HP is to install a smaller pulley on the blower, which creates the compressor "RPM 2" line. The System 1 curve for your current setup crosses this higher RPM line at the red dot, which achieves your objective of higher flow "Q2", but also creates a higher discharge pressure so air temperature is increased. Higher compressor RPM can lead to slipping belts and mechanical issues. More HP is taken from the crank to drive the blower.

The better way to get the higher flow is to reduce restriction in the supercharger/intercooler/engine system. This lower resistance curve labelled "System 2" crosses the original RPM 1 line at the white dot. As a result the compressor discharge pressure is lower and it flows more air without changing the pulley. The lower pressure also means lower air temperature, which helps prevent detonation. Less power is robbed from the crank.

Because you measure boost in the intake manifold, the boost reading depends on where you reduced restriction in the system. If you did it by installing a Supercooler, you reduced restriction ahead of the intake, and the increased compressor flow trying to jam through the same cylinder heads shows up as higher boost readings. If you reduced restriction by using better flowing heads you will likely see lower boost readings.