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SMP themselves said it's very personal, if you find that position perfect, not sliding forward etc. Then it's perfect.
Mine have the nose up a lots more, but felt well planted, no sliding back or forward.
Having the nose up can be useful when climbing and descending, the back of the saddle held you well as you spin to win, on the descend the front stop you from sliding forward when the whole bike is slightly forever downhill, it's lovely to finish a 20km descent without too much pressure on the hand.
Interestingly, just read the Steve Hogg article again, and he recommends keeping some rise up to the nose of the saddle, but I find it much more comfortable with the main bit horizontal.