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The SMP should appear tilted up i.e. a noticeable dip in the middle. If it's right for you then you should not feel any pressure. You should be sitting "in" the saddle if ya get me?
For reference, to get mine spot on I have an inline post, the rails are set forward and i dropped my post by about 20mm. Bike looks funny now but it is comfortable. Although now I wonder if I could drop down 1 frame size.
Perhaps move your saddle forward?