Meh, i've got friends running more than that (16+psi, 270rwkw). The thing to remember is that the candle that burns twice as bright lasts half as long. Maybe you can run 14psi for 3 years, 18psi for 1 year and 20psi for 6 months after which you need a rebuild. I pulled those numbers out of my bum, when you start to lean on the motor hard your tune becomes very important.