I think the index should be complete for that period on your CD - it is now complete to 1847 - should be easy to get a list of all sales to Cains in Michael
was this on the CD - I've been adding a few -
NSS May 1767 14 - dated 25 apr 1763;Robert Callister(Norristal) settles on eldest son John Callister estate (after decease of Robt) + purchased land viz qtrland Kion Droghad + intacks belonging purchased from John Clarke + wife cath als Callister + parcel of qtrland Ballamainagh purchased from Patrick Cain + wife Alice - all situate in Norrisdal;witt john tear, jane tear x;
(the purchased land is almost certainly that in NSS Oct 1751 17 as no other deed matches)