Sweetie,cant you see that regardless of what system you come up with for reviews,you are going to get abuse because you are dealing with human beings,of which some,will abuse the system for whatever reason.

The only way to satisfactorily deal with the review system is to punish its abusers.
Suspend anyone that abuses it for a probationary period.This applies to punters,escorts,kinkies,deaf people etc etc.You get my drift.

All of your suggestions are a bandaid approach.You are treating the symptoms not the cause.

Of course this is difficult when you wont abide by all of the rules yourself.

Take it easy,
West.