Hi canardlover
I use this calculator http://adamone.rchomepage.com/cg_canard.htm for the CG. It gives a safe nose heavy CG that I then adjust from flight tests. I'm not familiar with the % of foreplane loading method. From the very little interest in building Canards I have concluded that builders give up after the front end goes up 45 degrees during a landing and totals the plane. My Canards have all been made from Coroplast so the damage usually is minimal to none. My biggest problem has been a slight cyclic roll that becomes more pronounced with some up elevator input. I believe a lower Canard wing position would solve that since it appears that the Canard wing interferes with the airflow to the main wing. Plans and photos of my straight wing Canard are at http://www.rcuniverse.com/forum/m_3580825/tm.htm