Novice Saddle question

I tried to find a post related to this but probably overlooked it (12 hour work-day and counting).

My Trek 7.6 FX has the stock WSD saddle that came with it, and I am wondering about how many miles to give it to consider it a good test. The angle seems fine for me, and my 11-inch sit bones seem centered properly for this saddle. Occasionally I have had some rather odd sensations from it, not really numbness but it is difficult to describe. Not really pain, but discomfort. It doesn't happen all of the time, though of course the longest ride I have had on it so far was the 11 miler on Saturday.

I think it could also be related to being a novice, perhaps too tense of a riding position could lead to other oddities as well - so I do not want to rush this.