The suggestions I'd be able to make here all would be under-whelming. You're out of the range of expecting them to make a huge difference. Be that as it may: why not switch the narcotic to Oxycodone IR. It doesn't have to have the tylenol, so there's no cap to how much you can take. The combinations with hydrocodone make it hard to up the dose appropriately.

After surgery, I was giving Oxycodone SR (Oxycontin) and oxycodone IR (Immediate Release) for "rescue". In the end, I never used the long-acting, just the short acting.

There's also dilaudid and methadone.

I don't know a lot about the pump, but I see people on the spinal forum sometimes get spinal stimulators implanted to stop pain signals from travelling upwards.

Here's a video on the stimulator from my back surgeon's website.

http://www.pfol.com/newsroom.html