Yeah, I found the stock 20wt shock fluid to be too flaccid and went with 35wt as well. much better damping.
The stock shocks will leak if that bottom cap isn't tight. Or you could have some damaged o-rings. I think #60 o-rings from the hardware store will fit. Something else my bud turned me on to: shock socks from
www.badhorsie.com real cheap and they help keep your shock shafts clean. Available in many sizes and colors.