Just do it. No one will come down on you or anything. Do a quick A/B test. For the following clients, split them in two. Given side A your current rate, and sid

Just do it. No one will come down on you or anything. Do a quick A/B test. For the following clients, split them in two. Given side A your current rate, and side B your new rate. Measure the difference and prepare to realize that there is none. People who will hire you will hire you. Money gravitates to those who ask for it, and not to those who "deserve" it.