Jeff, I can build an ACC 3/60 that is 28.5" long with a 125 grain tip and vanes that pushes 450 grains. With feathers, which I prefer, it comes in right around 425.

Assuming I can get the Yukons to spine and weigh where I want them, does the ACC hold any additional advantages over them other than a bit better weight tolerance and possibly more durability (again, I don' t shoot groups or into hard, dense targets, so shouldn' t be a major concern)?

I assume ACCs or carbon in general is like golf club building. You only go with graphite shafts if you need to meet a weight goal. Other than that, steel (aluminum) is more consistently stable...