All good feedback from the panel members. We would not suggest that you have developed a resistance inasmuch as you have seen a response to the treatments. However, it's concerning that it has taken three treatments in an effort to find the correct dosing and desired outcome. The fact that these three treatments were done in a short time frame (6 weeks) is one factor in why patients do develop a resistance in some situations (ex: frequent dosing in less than 3 months).
It appears that you have a good baseline knowledge regarding realistic expectations and treatment goals. Being that you state that you like your physician, it may be worthwhile discussing all of your concerns for a logical explanation and/or remedy.
We have found that, in our practice, some patients choose to only treat their forehead. They later mistakingly believe that the frown lines are the same area and should have resolved with the forehead treatment. Having a complementary 2 week check up has proven valuable to address misunderstanding or concerns and to introduce new options.
Although your MD provided a complementary treatment, your time is valuable as well.