A problem with ejecting tools from the tailstock

The lathe tailstock has a mechanism which automatically ejects tools that are mounted in the morse taper of the quill. When the quill is retracted, the tool pops out. A problem often arises when the Jacobs chuck is too long and it ejects too early, leaving part of the calibrations un-useable.  Other tools may be too short and do not eject at all. What is the ideal length of the tool's morse taper?