Hi Jeff,

these days everybody seems to put them at the maximum distance aft, there is a measurement on this.

Also most are put in with maximum angle aft as well, this is also in the Measurement Rules. I put mine in straight, to try and get more lift. But I don't think it makes a lot of difference for an old boat, probably better to angle them back to avoid weather helm for a less experienced sailor.

Wouldn't bother with the Square Top, the one we experimented with we couldn't get to go any faster than standard sail . Also square top just makes the bows easier to bury. After all Mossie is fast enough as is .