It's not on fiche but on microfilm - for Douglas the book by Nigel Crowe on Douglas property c.1740 might help (available via shop at Manx Museum enquiries@mnh.gov.im) as this includes plans of the location of each property as well as its ownership - the 1760 copy of the composition book would stretch over 20+ pages per parish, lib vast has entries arranged by half year (courts met May/oct) in parish order - lib assed (man roll) also occupies many pages per parish -