I understand your situation completely.
My wife and I have two daughters from her first marriage, so they kept their father's surname, while she cahnged to mine. Our third daughter has my surname, so for a time we were in exactly the same situation. Both our eldest daughters have married, so no problem, except that the oldest had a daughter, and is now with a new partner so their son has his dad's name, my daughter and her daughter have her married name - gets confusing doesn't it.
My thinking is, if your daughters are of an age where they are used to their current surname, and don;t wish to change it, then you should leave that be. It is part of their identity, and at this stage of their lives, as they grow into young women, such issues become important.
As far as you changing your name back - i would avoid doing so, it will cause more problems than it solves.
To be honest, for the very few times when it becomes noticable - such as at airports, just learn to ignore how you feel. You, and all your family, know who they are, and how they relate to each other, and that is what matters. Airport staff and similar people encounter these scenarios every single day, and think absolultely nothing of it - they don;t have the time!
It's easy to imagine that people are looking at you and wondering about the different names, but trust me, they don't. It's like asking a waiter where the toilet is - a little embarassing for you, as common as asking for the salt for him.
Think of it like that, and don;t worry - in the scheme of things, this is far more commn than you might imagine, and far less important than you might think.
Hold your heads up, be proud of all your children, and let the looser face his responsibilities.