Sorry to hear that the Sergeant isn't working for you. You certainly have put it to the test. I have had better luck with my butt. Just completed 10,000 miles since April 12th, 2 1/2 months with the longest ride/day 660 miles. Compared to my FJR's Russell DayLong seat which I have over 170K on, I'm very happy with the Sergeant. Some times it just takes miles to get your butt in shape to do the long distance and day after day shape. I would try to rack up 25K before investing in another seat.
I had a Russell Day Long on my BMW K75S (which the FJ-09 replaced) - I loved that seat. The Sergeant digs into my legs at the edge where the welt cord is, and the slope is wrong. I placed blocks under the front to make it a better angle, but I still don't like it. Yesterday I did an 865 mile day on the Sergeant and I'm still in pain today. I don't think more miles is going to help that. Terry's seat looks very similar to the Daylong that I loved and the price is right, so giving it a try.
Terry just responded to my email inquiry - he's on vacation until the second week in July with build dates in August. So my Sergeant should be for sale here by September.