I'm another Chamberlain lover but today I had 2 fish of reasonable size not release my Chamberlain. I'm sure a minor adjustment will fix the issue.

Chamberlain stackers are coming out so I'm excited. I can't use attractors from the ball if I have Chamberlains but the stackers will make it possible.

Mike
Have you tried hooking your Chamberlain to the rigger cable swivel, then a verticle attractor between the Chamberlain and rigger ball at the end? From there you can hook on a horizontal to the ball if you want.Many including myself, use them that way.
Off to the salt tomorrow!
Richard