I am not the biggest advocate for shampoos, I am a pre-poo kind of woman. Shampoos tend to have a very drying effect on my strands due to their stripping components to maximize the ultimate cleanse, but for those who are dealing with heat damage this is just what the doctor ordered. Shampoos are cleaning agents, therefore will remove any buildup that can come from many products containing silicones. Silicones can retain moisture but they can also prevent moisture from penetrating your hair shaft which is a big no-no if you are recovering from heat damage.
Unfortunately if none of the previous steps work in the first couple of weeks, the damage may be to severe and ridding the damaged areas will be your only solution. Even though cutting and trimming is your last resort, hair grows back and as a transitioner, it is better to learn now than later when the damage could be even more severe.