http://www.max-boost.co.uk/max-boost...ensowalbro.gif
On this chart it looks like only a 10lph increase for lowering the base pressure 6 or 7psi. It looks like upping the voltage increases the flow 40lph at 70psi, and an increase of over 50lph at 64psi, seems like a MUCH better option.
That's between a 15-20% increase, I'm interested to see how well the boost a pump works for C3L1CA.