I might be reading too much into it but I think crossbow ace is a bit confusingly worded:
When you use Hunt Target or when you use Interact to reload your crossbow, if your next Strike with that crossbow before the end of your next turn is against your hunted target, add half your Wisdom modifier to your damage roll; if you are firing a simple crossbow on a qualifying attack, also increase the damage dice on that attack by one size (see page 91).
What exactly is a "simple crossbow"? Is it all crossbows that are simple weapons (i.e. all crossbows)? Is it the crossbow that is just named "crossbow" as opposed to the heavy & hand crossbows?
If it's the former, then the wording is a bit redundant. If the latter, a bit confusing!