Oh jeez, let me tell you something I pump EVERYDAY on the weekdays while I'm away from dd. I'll give you some hints and tips on what works for me and you can let me know if you've tried that.
First, sometimes women just aren't pumpers. The electric pump in style is what I use too and sometimes I wont get much out either. It's wonderful, if your a pumper. Your baby might just suck hard to get the milk out and that suck isn't hard enough with the pump.
Next, are you relaxing whenever you're pumping? Try this trick. Get two hairties and loop them around so that they look like a bow. Hold it up to your bra strap and loop it around that. Bring your pump up and put the other end of the tie around the horn. This should make it hands free for you. I know women who SWEAR by this. I cannot use it. It really only works if you have breast that are shaped a certain way. Mine are very round so it doesn't hold it right, but my friends have ones that go out more and can use it well.
Since your hands are free read a book/magazine/newspaper something to take your mind off the pumping. The more you're thinking "OMG I'm not making enough for my baby!" the less you're going to make. I've had this happen to me a lot. I have to relax.
How long are you pumping for? I suggest staying there for a full 20 minutes until after your second let down. At about 15 minutes start massaging your breast or doing compressions to them. It'll help get that excess milk out. You'll see it if you watch.
As for upping the supply I take this Fenugreek supplement and it works alright. It'll make you smell like a pancake though sometimes if you work out a lot lol. Hmmm...I ate oatmeal and that worked too. You're already drinking water so that's good too. Make sure you're getting enough calories. I think that just by breastfeeding you burn 600 a day so you need to make sure you're getting enough yourself.
So let me know if you've tried these. Hope they help out.
