Re: Poor Lip seal/Weak Suck
best way to boost supply is to just switch her back and forth as long as you can. try to switch her before she's furious and get her working on the other side. make sure you're drinking enough water, too.
good luck! i really encourage you to hang in there with the nursing because the strong likelihood is she'll get better at it, and in the long run it is WAY easier than exclusive pumping. you really do - as you said - want to keep the nursing experience, so it's important you keep bringing her to the breast when you're together. even if you always have to pump to supplement - and you might not always, if she gets a better suck - nursing is so important for both of you (for emotional & bonding reasons, and it'll still help you soothe hurts and put her to sleep and all that).
Nursing, pumping, cloth-diapering, babywearing, working professor mama with the awesomest SAHD ever.