Jumper,
From memory the suspension is set up for a rider with all the gear on of between 70 & 80 kgs, I dont know what that equates to in your lingo? I am aprox 83/84 kgs with my gear on but will leave it as is.
I would think you would want at least .46kg/mm fork springs and a PDS 4 for a shock spring. I am only 195lbs and this is what I use in my 02 650 and 01 520MXC. I have had several 230+ lb riders ride my bikes and comment on how well they work.
I put 48's in the front and a PDS8 in the rear. With gear I'm over 275lbs and it is set up well for the riding I do. But thats woods riding not desert bombing. Maybe if I did more high speed whoops or jumps I'd go stiffer; but for now it seems to be just right for me.