Most of the recommendations I have seen as well as my own experience suggests perfectly level front to back or, if preferred only a very slight angle downward in the front.

Sometimes a groove or hole seems to help. The most important thing is to make certain your "sit bones" are resting on the saddle.

Curiously enough, my first inclination was to avoid thin saddles. I bought a hybrid about a year ago and actually told the salesman, "I don't want a skinny seat that will disappear up ........."

Last week I bought my first road bike. It had a thin stock leather saddle which to my absolute amazement is extremely comfortable. I intend to change the saddle on my hybrid this weekend.

The recommendation to keep your saddle level also helps keep the weight off your arms and hands as the saddle tries to push you forward.

Carl