Re: What about a reversed ZPS?
i think a well designed device would not reverse the problem. frankly, i never had a problem with the ZPS, i don't get all this fuss about it. if it's well setup, it works, even if it's not so necessary. the real problem with the Edge family is the pull-up causing sharp tuning return. probably a kind of an ESP Arming Adjuster, which you can fine tune to keep the trem block to zero, don't know.
but then, why not a better designed set of posts? this would cut any problems directly at the source, i think.