Im 230, love to knee drag.
The bike is a tank compared to my old 750.
I got tired of it and set up the suspension.
Do some research on the forum, there is an awesome setup thread. U need to know the info it has.
I concluded a front baseline of:
preload - 2 lines showing
Top of fork dampening - 3 clicks out
Bottom of fork dampening 4 clicks out.
Rear shock:
Preload - i adjusted my shock according to proper 'sag' measurements for my weight.
Top dampening - 3 clicks out
Bottom dampening - 4 clicks out
This loosened the bike up IMMENSELY for me. I like the rear higher, corners better.
Then i tighten everything 1-2 clicks when a passenger is on, and if im going spirited riding i will tighten the bottom dampeners 1 clicks and loosen the top 1 click.
The front is NOT made for our heavier weight. U will need to re-spring for optimal use, but maybe try one to two lines out in front preload and tighten her dampenings up a bit.
Make sure to measure, and thus adjust the sag tho, thats ur ticket home.
Then play with dampenings until u like how she responds to bumps.
Im sure some guys here with chime in with other practical suggestions tho.
Take care