Two updates to this.
First, on a road bike I'm loving the forma. Did a Super randonneur and many many miles on it this year.
Second, I have bought a time trial bike. The forma is not flat enough for the aggressive position. I did a 200k in 7hrs but the forma didn't feel comfortable while on the Tri bars for extended times.
I've added another addition to the family. A selle SMP T4. Hopefully this will solve my issues on the TT bike the same as the forma did with my road riding. I'll update over the next few weeks!