Glad to see you got that thing bolted together.

I cant help on the rating.

Yes, to the cradles not rollers.

Rear beam risers were traditionally made for the HT out of carbon, only a handful of boats added them, the boat will slap the chop downwind, but you'll need a very short steep chop and frankly the condition that causes the slap doesnt happen that often in my opinion. If its honking out, it will happen, but under 15knots probably not very often. I wouldnt worry about it for now. Chicken lines are an easy way to deal with the slap. The Risers I've seen were made by a guy in P'cola area, Bauwman I think was his name, I probably butchered that. Anyway, carbon bolted to aluminum isnt a good idea, its a nice way to get all kinds of electron swapping. I wouldnt do it.

If you are really set on risers, call Forte RTS, order a new carbon rear beam for $400, he's got the spec's, ask him nicely for a couple of cut-offs of the same diameter and glue them on, layer on carbon cloth to taste. I can post pictures of my beam at some later point.

Bill