That would appear accurate. Remember as late as 2010 the Tiger was still a competitive platform, with new boards and sails (and maybe rig). I think the issue is more related to the sailors on the boat, fast sailors are on more modern platforms. Of course the fact that the rating drop applies to all boats may not be fair but measuring your individual boat may not really be viable. We have an ARC22 in our fleet and I think they are using a N20 rating right now, and we're under SCHRS.