One other suggestion is to get a seatpost with a 2-bolt rocker style clamping mechanism. These allow very fine adjustments to the saddle angle. The single bolt styles that rely on coarse serrations for adjustment can often produce an angle that's either too high or to low.

Some saddles are curved from front to back, so figuring out what constitutes a "level" saddle is tricky. With the old Fizik Gobi, I placed a small level on the saddle and set the nose, so it was about 10mm lower than the tail. This produced a lowest spot somewhere near the middle. If the saddle had been set with the nose level with the tail, it would have given the rider an extreme nose-up feel and been very uncomfortable.