I am also a Moore Worldwide YDNA participant through my brother. We are in group 2 #130051 and a close match to Geoff's ancestor. We can only document back to 1756 Halifax, VA..but land and church records indicate immigration from Ireland around 1722. I see a couple of Lusk's with a 62/67 distance from us. I have not looked to see if the marker difference is on fast or slow markers.If you are not an exact match with any of the Moore participant there may be another reason our surnames are showing up together. Since the Moore surname is old, it is possible the reason is: "Related Before the Establishment of Surnames - The common ancestor you share with individuals of different surnames on the Y-DNA line may be many, many generations back in your family tree, prior to the establishment of hereditary surnames (which occurred in England around 1300). This is the most likely reason for Y-DNA matches with individuals of different surnames"
Several of us are SNP testing to see if we can trace our SNP back to the origin of our ancestor taking their surnames.Theoretically, when there are several surnames(Montgomery, Alexander, Lusk, ect) with close dna matches it may be that our ancestors chose a different surname. At the present time we are R1b1a2a1a1b4* The (*) means they have not discovered our terminal SNP.The R-L21 group admin and participants posts charts and this one indicates we took our surname around 1300 to 1500 AD. We are under L-21 in the purple link down to DF5. This is the link to his chart. My email firstname.lastname@example.org Nice to meet you,Janice Moore Cronan http://f1.grp.yahoofs.com/v1/0Jf8T25RFa21fBZnPrkEq5K4yiJGLnRgCWnVc5pEAdjB9oSkeYxJy5f2YCHIdcAhRwY3NrnzfPWojyfcN3W-MyMlWU0bN5dpHw/Haplogroup_R-L21_Tree-Timeline.jpghttp://f1.grp.yahoofs.com/v1/0Jf8T25RFa21fBZnPrkEq5K4yiJGLnRgCWnVc5pEAdjB9oSkeYxJy5f2YCHIdcAhRwY3NrnzfPWojyfcN3W-MyMlWU0bN5dpHw/Haplogroup_R-L21_Tree-Timeline.jpg