I disagree with the saddle nose-down thing. That's always going to put weight on your hands because you're always pushing back. That's not good for riding any distance. Instead of tilting the nose down, try to find a saddle that doesn't have any saddle where the stuff that's making you numb is. I level the exact part of the saddle where my bones are perched, not the entire saddle, which, no matter how flat they look are usually not exactly flat. The perfect position in the perfect shorts on the perfect saddle does take some time and experimentation to arrive at, that's for sure, a many year's journey for some of us.