Seakeeping of mooring FPSO
 

I want to make simulation on the turret mooring of FPSO but I have problem when I do the sea-keeping. I try with some of the cable but it never works, the FPSO keep bouncing off from the sea when i use catenary mooring line. Another problem when I try use the polynomial the FPSO start capsize slowly. Sorry I do not know so much about how to make use on the mooring line. I try everything. Maybe I don't understand the meaning of this parameters and thus I put wrong values. Can someone please explain me what have I to do to analyze the cable's effects on the system. Is there something missing? Can anyone help me.