DoubleA, your river check % seems really high, I guess it depends a lot on the table you're playing at.
It might suggest though that you're not value betting very thin? Or maybe you check/raise the river a bit?
My river check is at 43% (for 6max), I'm not sure if that's good or terrible, or if the big difference between yours and mine even means that one of us is doing something wrong. Still, it's a noticeably big difference. I do tend to value bet very thinly and I'm making the assumption that this is what's making the difference, maybe your river check % works better than mine (no way to tell really) but it'd still be a good idea to keep an eye out for situations where you could bet that you don't already.
Pokerman, your W$SD is fine. I think it depends on how often you go to showdown as well, but 45%-60% W$SD is pretty much the "optimal" range. It should be low because it's very frequently correct to make river calls.
If your opponent bets the pot then you should be ahead only 33% of the time for the call to be neutral EV, if they bet say 20% of the pot then should be calling really wide (depending on the frequency you think they'd be bluffing). In other words, being a calling station on the river when faced with pot size or smaller bets, is generally going to be +EV.