I don't watch golf, but watch lots of baseball. before using the AVR, I did not have issues with the ball motion specifically. I had "judder" intermittently/unpredictably. motion on the screen would appear jerky and not smooth. it could be people running around, a pitcher walking up on the mound (legs would not move smoothly. back a bit in this thread, I mentioned that transformers (first one) on FX HD, was unwatchable. All of this was with any setting of the motion enhancement feature (off, 120Hz low, high, on up).
On a hunch that it was something in the stream from the cable box (which is set to output 1080i), I forced the receiver to output 1080p. Then the display should be doing no processing. note if you feed it 1080i or lower resolution, it will either de-interlace (in the case of 1080i) or upconvert (for 720p), or both (for resolutions less than 720p). this removes both the cable box and the display from the equation.
I'm happy now. Sometimes I think I'm seeing something, but it's just camera bounce. I watched the second matrix moving last night on AMC HD and it looked fantastic.
Hope this helps. Also note that having to work around "weaknesses" is not uncommon. one of my prior HDTV's (50'' toshiba 50hx81, a 2002 rptv), had terrible internal upconversion. the only work around was to feed it 1080i. This was easy on cable (comcast). For dvd play back which is 480i, I had to make sure I used dvd players that upconverted via component connections (the 50hx81 only had analog inputs, no dvi or newer). examples of these dvd players were some zeniths, lg and oppo's. Now I'm all HDMI and life is good on that front. (sorry for the digression).