I kept having random judder - but it seems to have been caused by the MP Audiorenderer?? As going back to Reclock has made everything pretty darn smooth. Nearly as good as ar-jar's original in MPC-HC, or madVR. Yay. Thankyou!
Please post more detailed information into the audio renderer thread. It might be for example that the whole audio renderer is not active in some cases (not supported audio formats on HW etc.). Or it could be simply a bug in the audio renderer.