ah a formula I know

We use Parents Choice aswell. Do you use powder or concentrate??
While I don't think its nessasarily unrealistic for a LO of 4 months to sleep throught the night, I also don't find it that common either. Most 4 month olds I know wake at least once a night. In a group of 12 LO in my area all born in the same week, only 3 slept through by four months. My neighbors 6 month old for example, just started too, while my LO started to at 3 months.
Your LO is actually not doing to bad at all

To go from 8pm-3am without a feed is pretty good. Have you tried a dreamfeed yet?
It sounds like it's just the morning that needs work by the sound of it. Thats what I'd like to try and help you with.
Although it also sounds like you may have to start weaning her off of the paci if she's starting to wake for it. It may be time to introduce a lovie.
Don't expect you DD to sleep as long as your DS, every child is different. The more you compare the mor frustrated you'll become.
As for the feeding. Do you have an actual routine set up? It sounds like she may be starting to become a snacker, and not taking full feeds.
Also how much daytime sleep does she get? what are your naps like?
Could you send me a copy of your full daytime routine? That may help.