Two points I would make. If you have a service manual for your bike have a look at the "standard settings" first then adjust from there. We sorted my Mrs bike out no problem. The previous owner of the ZX9R was way tall and big as well, and the Mrs complained about it bucking and everything was set up very stiff.

If you don't have a service manual I recommend asking your local dealer what the standard damper settings are for your bike as they will pull out the service manual for your bike and show you for free. Gives a rough guide for settings for a pillion as well.

Worked for me anyway and once on the std setting then you will not be far away. and should not need to go more than a click or two one way or the other to fine tune