Well the Taipans seem to think their square top mainsail has had no effect on performance - hence no handicap change. Could this mean the SCHRS idea is right, and all these "high performance" classes are going square top for no reason other than asthetics?
Hardly seems likely does it?

SCHRS also penalises larger centreboards which is not good for Mosquitoes since we use centreboards with nearly half the area allowed under the class rules.

I think the problem with any measurement rating is that older existing classes obviously can't be optimised to the rating whereas newer (esp. box-rule) classes can be optimised. Also any rating rule is still just another subjective set of ideas thought up by someone - not necessarily any better than VYC, and no less subject to endless arguments.

I guess SCHRS is just an alternative. Not necessarily a solution.
The real solution is for YA and state YAs to simply ban all the small classes from regattas so we end up with a few one design fleets and then we don't need a handicap system !!