If you are seeing nearly 100% failure after service, or 50%, or 10%, or 5%, you need a new regulator technician. A properly serviced regulator, properly cleaned, properly cycled and tested prior to final adjustment, and PROPERLY adjusted to a reasonable cracking effort WILL NOT fail or free-flow, barring some mechanical breakdown that could not have been anticipated during service. Now, the word "properly" requires someone who knows what they are doing, and there are many, many of them around. Unfortunately, I hear that many stores have someone who is POSING as a regulator technician, without really knowing what they are doing. So sad.
Anyway, just my opinion.
Phil Ellis
www.divesports.com