for this period your main source must the few scarff wills (most 18thC ones are summarised on manxnotebook (see above), land records (tho if someone went to Carolina in 1660's generally as indentured servant in desperation), or court records - Libri Cancellarii, containing actions, decrees, &c., of the Chancery Court (and its successor) — dates 1578-1890;
Libri Placitorum, or Books of Common Pleas, containing actions in that court, and the names of its officers, juries, inquests, &c. — dates 1496-1901;

Libri Scaccarii, or Exchequer Books, containing judgments on breaches of penal statutes, appeals from the Spiritual Court, &c. (abreviated Lib Scacc) - dates (1580-1847

some are on mormon microfilms others at Manx Museum - none are indexed!