Okay, the main issue I see here is that she needs to be nursing more often. This could be part of the reason she is getting plugged ducts. It's not that baby isn't getting enough per feeding, it's that baby isn't feeding frequently enough. It is ABSOLUTELY NORMAL for a brand new baby to nurse 30 minutes and then want to nurse again 20 minutes after finishing a feeding- that makes almost an hour between feedings (since you time them from the beginning of one session to the beginning of the next), which is about average for a newborn- sometimes they'll go longer, sometimes shorter. As I said before, their tummies are tiny at this point and breastmilk digests very quickly, so try not to pay attention to the clock or how long it's been since the last feeding and if baby seems to want to nurse- nurse him. So just to be clear, that pattern you describe of nursing-sleeping-nursing again within the hour-TOTALLY NORMAL.
You are getting plenty of wet diapers, so that's great. As long as you're getting at least 5-6 per day your baby is getting enough milk, so keep that in mind as you cut back on the formula. It shouldn't be too difficult to eliminate that one feeding per day.
Also totally normal not to respond to the pump, especially in the beginning or if she is very engorged. The pump is NOT an indicator of what happens when the baby nurses because the mechanics are totally different. Don't think since you aren't getting much when pumping that baby isn't getting much when nursing.
Check the link I posted before about dealing with cracks, there are some great tips in there about how to treat them, how to nurse when you have them, and how to deal with it if they are too painful to nurse.