WR450F suspension spring rate with YamaLink lowering

Murray rides a WR450F and weighs 220 pounds, and he wanted to know about proper spring rates:

"The 2003 WR450F has a stock spring rate of 5.3 kg/mm. At 220 pounds (before gear) with the STOCK setup the spring rate for your weight is a recommended 5.7 kg/mm.

With the YamaLink's extra leverage the spring rate for your weight is 6.0 kg/mm

With proper sag you want the WRF to bottom just once or twice per ride but I know for a fact at your weight and the stock spring you are bottoming a lot more, the bike may understeer and you have too much sag. This is happening with and without the YamaLink because the 2003 WRF comes sprung for a ride weighing around 180 pounds."