I appreciate the inputs from you and nubcake on this...so, for a double check, is there a good opening pressure to shoot for? I totally understand that balancing the 2 to open at equal pressures is the primary goal, but there is a big difference between 6 and 9 psi...do you have a target suggestion? I'm inclined to assume closer to 6, but a solid number from those that know would be appreciated.