So the F18's think they are hard done by under SCHRS.

The F18's have developed a long way in recent years and the new handicap number is just representing that fact. If anyone has an older design then the SCHRS is set up to not penalise them, at any stage you can get your boat measured and almost certainly if you have short dagger boards and an old fashioned pintop style sail + your hull is around the 200lbs, then you almost certainly will have a higher rating then a more modern boat.

Do at least give it a go in getting an individual rating for your boat, you maybe pleasantly surprised.