I have a history of calf/Achilles issues, and one thing I've found is that working on my feet has helped a LOT with that. It took mobilization by the PT to get my rigid feet and ankles to start to work like joints again, a lot of spiky roller work which hurt like !@#$@% (walking on pebbles is an alternative), plenty of strength and proprioceptive work, and I'm still in process. But they are much, much better.
One thing I wasn't expecting was how weak they were in places, for all the tightness. It makes sense of course. The single most helpful exercise has been the single leg calf raises. I started with my hands on a rail (a light touch was enough, but made all the difference in the world when I had very little proprioception) and I've finally progressed to sometimes being able to do 15 straight with no hands. As tough as they are, they give me near instant relief.
As I said in the other thread, "four corners of the feet" - lifting all three arches - works even inside a cycling shoe, and I pay as much attention to my feet as I can when I'm riding.
Fit is key, along with not ankling, but I know you've been through your fit six ways to Sunday.
Speed comes from what you put behind you. - Judi Ketteler