Wow! That's some serious pumping you've done, I would head the warnings, if at all possible get them checked, at least take some time off to heal and reassess afterwards.
I've just realized I've been over pumping too, I thought the guide said -5 inches HG not 0.5 !!!! Oops. I've not suffered anything more than some discolouration, and I'm really going to struggle to keep to it, ill see how it goes.
If I had remembered I'd seen those cups on eBay, I would have bought them, as they look to have a decent sized lip to seal and spread the pressure.
But I've bought the Noogleberrys now.
On a positive note the pumping I've been doing has definitely made a small difference, having broken the big cups I've reverted to nipple pumping, so I'm still doing something, and they droop, before they were tight against my chest muscles, now they and at an angle..... YAY!!
Danni X