Fork Oil Weights

[XRR]

I recently changed the fork oils in my XR650R to 15 weight on the advice of a friend. I beleieve its normally 5W. As I am quite heavy at 110kg it has improved the feel and ride of the bike, although alot stiffer. My only concern is whether adding more dense oil will load other components of the bike or suspension past their limits. ie. have i made the suspension to stiff to absorb bumps etc before the rest of the bike.

Thanks