I did a comparison of three seats, including the Corbin here>
http://www.spyderlovers.com/forums/s...ght=seats+tall
In doing so, I installed and reinstalled the 3 seats a number of times. The Corbin seat is heavy and very solid. Once I figured out how to readjust the front/back position, the pin would seat correctly. I kept the back pins loosely tightened, closed the seat to insert the pin. Opened the seat while pushing backwards to not lose the back hinge position. Then tightened. It worked easily. I also discovered that after a bit of riding, the pin inserted correctly without much adjustment on installing again. The slight overlap into the glove box also went away. It just takes a bit of time in the saddle.
I didn't see this as a design flaw at all. It seemed that this seat had more "settling in time" than the BRP comfort seat which is quite flimsy in comparison.