The wills are online - the parish records will be on CD but these are available on mormon film anyway (the IGI has mixed up some years as some headings are missing + the usual amount of patron submitted errors) - most of other new material is summarised deeds which would be after the date you are interested tho I've added a few more Malew deeds + have more to add but think I did all obvious Looney deeds by time you bought CD
The will indices (eg www.iomfhs.im + my 17th C episcopal wills) are online as are burials so you can check for absence of Llewellins until mid 18th C when a merchant by that name came over as part of running trade.