What kind of drops are you putting in daily? I once had a dog that got a lot of ear infections and my vet gave me an ear cleansing solution that just had to be used 2-3 times a week. It was supposed to lower the pH level in the ear and make it harder for infections to develop. (it wasn't used to treat infections, but to prevent them) I had to squirt it in, rub it around well and let the dog shake it out again. Seemed to work. Actually come to think of it, I've had a couple of dogs over the years that have been treated the same way. I can't remember the name of the first solution that I got from the vet, but I think the second one was called Epi-Otic or something similar.
Beware of Mushers...They will suck you into their addiction!
If your dog thinks you're the best, don't seek a second opinion!