I just found another sentence from Oral Literature from Dunquin by Heinrich Wagner:



So I guess tharraing is pronounced thairig (with a slender r), or do you think this is just an idiolectal pronunciation?

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I'm an intermediate speaker of the Corca Dhuibhne dialect of Irish and also have knowledge on the old spelling
Soir gaċ síar, fé ḋeireaḋ thíar

Tharraig and thairrig are both found in Muskerry, and Amhlaoibh Ó Loingsigh had both.

p65 of Níl Deireadh Ráite has "do bhuail clúdach air", where sí is the omitted pronoun.

Lenition of concrete, non-general nouns following ar is the rule (in Standard Irish, at least).
Ó Dónail has "ar fhleasc [mo] dhroma", too.