48mm Cone Valve setup

How much fork preload is every running? Are you guys bottoming the fork every time you ride? My fork feels really good but i am bottoming them almost every time i ride. Should i try adding more oil? Maybe they need to be revalved stiffer?
I raced on the AER fork all this year and its almost impossible to bottom those forks. so I kind of like the fork riding high in stroke from being on air forks.

Current settings (sand/soft tracks)
18 FC450
Weight (155lbs)
4.6
10C
14C
2 clicks of preload
350ML

Thanks Jack.