Attached shows the trim you can expect from MLM with respect to speed.  

The curve is based on CoE at 4m above waterline (maybe low) and all weight carried on lw hull - so a limit condition but not necessarily the worst state particularly if you articulate the ww hull and it has its aft end bouncing along.  This will push the lw hull even more bow down.

If you ever see the top end of the speeds shown then nosedive will be a possibility.  In the range 7 to 12kts MLM should run with almost level trim.  

The trim will be a limitation for the height of rig you can use effectively.  So this brings up efficient low aspect rigs

It is common to see airfoil fencing in some applications like these:

But fencing or winglets are not so common on yacht  sails although there are a few keels with them.