Help in fast power boat design

[AntonioCasas]

hi
I´m new in this forum, and I must say english is not my mother tongue, so my appologies for my spelling mistakes.

I´m involved in the design of a cabin cruise power boat. 15.5m LOA, 3.1 m chine beam, 21 degree deadrise angle at stern, about 9000 kg full load displacement, 2x820 hp Seatek engines , LCG full at 5.3 m from stern, estimated speed 56 to 57 knots at 2.4 to 2.3 trim angle, two steppeds hull, and custom surface drives propulsion.
I do not have any Idea of how to dimension, shape and distribute Chines, and lifting strakes or spray rails. I read some where that chines+strikes should be around 20% of the beam wl. Also that chines width should be about 3 to 5% beam wl. Down angle for chines not higher than 5 degree, and down angle for strikes not higher than 15 degree. With the information I submited about the boat, can any one give me some more clues about dimensions, shape and disposal for chines and strakes?
Thank´s in advanced,

Antonio Casas