Your points 2 & 3 contradict each other. Which one is it... pressure or velocity? It has to be one or the other, not both. What determines if the pressure is too high? Velocity? Yet, you say that you may max out in psi before attaining max velocity. Who, or what determines that? It's like saying the warranty on my van expires at 100,000km or 36 months, whichever comes first.