As far as the PC goes Id reccomend that you make it a priority to practice your scale once up and down and rest a second, listen for passing notes
this will start to make your lips stronger, then practice G Grace note befor your melody note, practice the whole scale with G grace note then D then E resting in between, each run. Forget AG, practice the scale, grace notes and doublings from every melody note, until you crack this you wont progress, and youll be that busy concentrationg you wont notice your lips!! make sure you have a couple of seconds break before you perform each excercise. PM me if you need more advice