Doug

With a cambered board, the rudders can be located closer to the ends and also be relatively small.  That is the most efficient overall and there is no need to raise the leading rudder as it has low drag.  With this combination of rudders and board plus single mast, a HP is not balanced but it will point high and has good control above 4kts.

We have played around trying to get the boat to sail from a luffed position by setting the leading rudder at 90 degrees and the trailing rudder in line to shift the CLR aft.  It takes about 40 minutes to turn far enough off the wind before bringing on the sail to get drive and taking the leading rudder out of its stalled position.  It is much faster just to shunt out of the luff and turn into the wind on the reverse shunt before trying to take off on the new tack - maybe 3 minutes.

The standard HP with just two big rudders near the beams will balance with a single mast and just the trailing rudder immersed but it is not as efficient because the rudders are symmetrical and have lower L/D than a cambered board.

It is also easy to manage the loads on a cambered board than on a rudder because it can be braced against the cockpit from a point below the waterline. 

You have to distinguish between balance and control.  A boat that stays balanced will hold its course relative to the wind with the rudders just trailing.  A boat that can hold as course with steering input is under control.

Rick

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