Fasti ecclesiae scoticanae is available online on openlibrary.org try the following links
https://archive.org/search.php?query=Fasti%20ecclesiae%20scoticanae%20AND%20mediatype%3Atexts
There are at least 10 volumes covering all the presbyteries and synods.These are the first two_
Fasti ecclesiae scoticanae; the succession of ministers in the Church of Scotland from the reformation (Volume v.1)
Fasti ecclesiae scoticanae; the succession of ministers in the Church of Scotland from the reformation (Volume v.2)
There is an index at the backof each volume as well as search box which will throw up the page numbers for a name.
regards George
There is an index at the back of each volume which should speed up your 'trawling'.