another suspension/preload question

[ddtwelve]

I went this weekend to have a look at the BMW f800st and when I sat on it the suspension was lovly and pliable not like my fz6 I couldn't mess with the preload on the BMW as was a customer's bike he just let me have a sit on it, the question is should the fz be more bouncy as when I sit on it on preload 3 setting I get the 25-35 mm preload drop or does my suspension need stripping and greasing, what preload do you use as im 90 kg with no bike gear :-S