Hey Gary.
We had a Irwin laid on top and its pretty close, the guy in the pic "Graham" is the owner of the EVO loft here in QLD. You wouldn't know from the pic but they seem very powerful and they spent the day trying to de-power- them but its hard to compare as there is only one Irwin sail here (Furball) and he is often hard to find, So I guess we will have to see how they go. As for the luff curve it measures all full to the measurements so Im not sure what else could be done with the shape, as you can see they have the boom mounted lower than most of your boats down south may be this makes this look short? not sure. With a bit more testing we should have them working well just need to get amongst you guys for the real bench mark.we should have better reports soon
Cheers