Hey jrod:
I'm probably starting to sound like a broken record to some, but if you find a new PM doc (and I hope you do) It wouldn't be a bad idea to ask about a long acting med such as oxycintin (there are several, but thats what I take). It sounds like you are taking more of the percoset because it's not lasting long enough. Instant release meds usually only work or stay in your system for about 2-3 hours, where a time released/long acting med will slowly release over a period of roughly 8 hours. Instant release are usually prescribed for "breakthrough pain". This method works so much better.
I know that not all docs or all states have the same prescribing rules and regulations, so I don't know if this will be an option for you, but if it is, I can definitely say it changed my life. You'll see that several of us here take these types of meds.
Good luck with everything and keep us posted. cmpgirl