After having a fit recently, I discovered I needed a seatpost with more setback.
I was frustrated to find that most seatpost manufacturers don't post setback values in the specs on their seatposts.
I have also heard that there is no industry standard as to how setback is measured.
My request to you is this.
Why don't you set a standard as to how setback is measured, and add that important piece of information to the specs on your websites.