WOO HOO!
So, I replaced the EGR, ran some Redline Fuel injector cleaner (couldn't find the BG44K), and ran through a tank of gas. New numbers:
-At 15mph (1658 rpm), HC (PPM) was 115, max is 123, CO (%) was 0.60, max is 0.73, and NO (PPM) was 1012, max is 1015. Whew!
-At 25mph (1612 rpm), HC...