Embouchure diagnostics really needs in-person observation from a knowledgable player, but here are some immediate thoughts:
With your jaw slightly forward, are your upper and lower teeth aligned?
As well as thinking about the forward position of your jaw, is the jaw opening correct?
Are your chin muscles working to correctly support your embouchure?
This is a great article which highlights a lot of common embouchure problems:
http://wendellworld.com/html/Embouchure.pdfThe equivalent passages in the books by Downing, Farkas and Schuller are all very good as well.
There are some differences in the advice, so it's worth reading them all to gain a balanced view and then carrying out playing experiments whilst using a mirror to find what works for you.
Just to reiterate, it's also worth getting in-person advice from other players and/or a teacher...