Using the standard seatpost that came with my bike, a Giant TCR Advanced.
Crank size 165, because the standard 172.5 was restricting breathing too much.
Compared to my road bike position, I shifted my saddle foreward and up to account for the change relative to BB and crank length.
Getting a new saddle (Bontrager Hilo Comp) today, so maybe I that has a different rail position allowing it to closer to my BB. Hope it’s at least more comfy than the saddle I’m using now (Pro Stealth).