Thanks.... I am looking at page 73 in Catamaran Racing for the 90.... It has a pretty diagram.

And, I talked to a gent that has these on his P-19.... he has the rake set so that the leading edge of the rudder at the bottom after you take the slop out is about 1/2" aft of the rear of the transom.... But this is on a 19MX....

Guess we'll start there and work my way to the right setting.... Once I get the mast rake figured out...