A few things:
1. Picture of bike? You on bike? Bike is better than nothing, you on bike will reveal more. Basic information helps too - how often do you stand out of the saddle? If it's less than every 30 min you'll be numb I guarantee it. A while ago I checked how often I stand and it ended up about every 5-10 min.
2. Check out Competitive Cyclist. They have some basic fit type stuff - you measure, plug in numbers, and you get some "recommendations". Try it as a sanity check, i.e. to make sure you're within the realm.
3. BB -> Saddle -> Bars. Set position in that order. It's a different way of saying what bkmk said - adjust reach by changing/adjusting stem, not by moving saddle.
4. You have three contact points (five if you count the pedals twice and hands twice). You'll be balancing pressure between them. Unweight one and you'll weight another. You've mentioned hands and saddle. The point that seems to be "light" are the pedals. If you ride harder, particularly if you focus on the downstroke, you'll unweight the hands and saddle a bit.

I hope this helps,
cdr