Need advice on carpenter ants
Drione dust would be a good strategy-however it is a lot of work, but it will create an environment toxic to insects in the voids for a long time. Using baits for carpenter ants is really hit or miss, usually doesn't work-sounds like you're having success with bait, though.
The fact that you are finding dead ants is a good sign. Any treatment using repellent insecticides, which is most over the counter ones, including drione and spectracide could move the ants, but it could also solve the problem. Again, the dead ants are a good sign.
Using termidor outside (non-repellent) around the house perimeter, high and low, has a better chance of colony elimination over several weeks. Carpenter ants send foragers to the outside, even though the nest may be inside, thus slowly picking up the termidor.