Based on the comments above, I went back and reset my weights in the 100.  I set 59 passengers and about 5 cargo boxes.   Weight was about 16500 in passengers/cargo.  Then loaded 20% fuel in all three tanks and did some loops around KDCA.  MUCH better.  (Didn't bring the total weights and don't have them in front of me, but you get the idea.)  Now I need to test it in flight where the AP has been on, so I can see if part of it is the yoke oscillations.  But, was able to fly a stable approach at 140ish and do a couple T&Gs and a full stop.  

Thanks all!