Laura, I don't believe that all of the Wilson families in Tartaraghan were related; ie, some may have been English and some may have been Scottish. My husband only has 2% Scottish DNA from his latest estimate (which is, at best, a guess). One clue may be looking at their religion. If they followed the Presbyterians, I would hazard a guess that they were more likely to have been Scottish.
The one DNA match that hubby does have is to a Courtney/Wilson line who would have married around 1790. Anna Wilson was said to have been born in Scotland, daughter of John Wilson, born 1713 in Methlick, Aberdeenshire (birth year should likely have been somewhat later than this as he died in 1812 in Aberdeenshire). If you've done a DNA test on Ancestry, have a look and see if you have a match to a DKERSA who has provided this info.