Some background:
Car: 83 GL, EA81 w/ ~343k miles, California model, Hitachi feedback carb (can't replace it with a Weber, because I live in California

So here are the results (top line is 15mph, bottom line is 25mph):
First test:
HC:
MAX - 152, MEAS - 15
MAX - 123, MEAS - 9
CO:
MAX - 1.05, MEAS - 0.12
MAX - 0.85, MEAS - 0.12
NO:
MAX - 1191, MEAS - 1690
MAX - 1021, MEAS - 2181
Second test:
HC:
MAX - 152, MEAS - 0
MAX - 123, MEAS - 0
CO:
MAX - 1.05, MEAS - 0.11
MAX - 0.85, MEAS - 0.10
NO:
MAX - 1191, MEAS - 2624
MAX - 1021, MEAS - 2401
All sources point to the EGR (or at least to me... if something else stand outs, let me know). So, I pulled the valve and cleaned it out with a dental pick and some B-12. The diaphragm is good and holds vacuum. Now, when I manually apply vacuum to valve, the engine does nothing. No stumble, no stall, no nothing. This leaves the EGR pipe, but that SOB is a PITA and doesn't want to budge (not to mention my busted knuckles).
Any pointers removing it... or maybe cleaning it in place (pipe cleaner)?