OP
I have done the bucket test, sort of.... It starts to free flow before the mouth piece is in the water, I didn't measure how deep that was though- not a good assumption....
Since you don't have testing equipment, try the "bucket check". Take a bucket of water, and, with the regulator charged, very slowly lower it, mouthpiece up, into the bucket. Some of the mouthpiece should still be out of the water when it begins to flow. If not, the tune is not so good.....