Not 15psi between them,they need to be within 10% of each other (which would be 15psi at 150psi so meh lol)
Sucks man,but honestly I never mind repairs. They show a weakness and are an oppurtunity for improvement!
At least that's what I tell myself after I throw the wrench.
Use a leakdown tester to determine where your compression is going.
[This message has been edited by DefEddie (edited 01-31-2014).]