@ Jake, Pirate and Redtwin, thanks for the comments on the luff. To be honest we also got a comment from a fellow sailor during the earlier mentioned competition. He was asking about the "full" sail, but we never got to the part of how to check it on shore and on the water. We will most certainly check with both mentioned methods. (And yes, the tack should be a little tighter.)
@Pirate, I agree with you the shroud seems loose. However pleae believe me if I say our rigging is rather tight. On this type of boat we do not have the ajustable system yet (as on the Infusion) so we use the main sheet and traps to set the tension on the shrouds. They feel "hard", especially compared to many other boats. (but who sais they know?) Maybe we should check anyway when we have somebody with a gauge available.
And just in case we get in the same situation again: Is there anybody who wants to react to the question from point 3? Downwind without the spi? It would be appreciated!