[PSUBS-MAILIST] compensation problems

[hank pronk via Personal_Submersibles]

Every time I take Gamma out to any real depth, I loose oil from my prop shaft.  The magnetic coupler swims in oil with a shaft bearing in oil then a seal to keep the oil in.  The seal never leaks just sitting around.  I have tried a couple of different compensation methods, a squeeze ball, an bicycle tube.  I am positive all the air is out of the system.  Is my compensation bladder area to large?
Hank