Dear Thebiggerthebetter,
some people dissolve fillers faster than others. I perform a lot of lip injections with fillers such as juvederm and it works great. Many times I need to put more in one side than the other to attempt to even out the vermillion border (The red line of the lip)....
Thank you for your question, You would get a nice improvement with lip fillers. Volbella, Restylane, and Juvederm are good to create a symmetrical lip. NovaThreads can be used to improve lift and shape. Implants or fat are alternatives. Technique will be important here, so you'll want to see ...