If you leave it at 5psi, your beer is gonna de-carbonate down to whatever 5psi gives for CO2 volumes.
You'll be better off at 10-12psi, and balance the system with approriate length of tap lines.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10