enricmm wrote:It mentions that it only applies to adjectives, but not pronouns.
I think you may be reading it wrong. (I'll check myself when I get back home where my copy is.) Caol le caol agus leathan le leathan is one of the most basic rules of the language. True exceptions to it are few and far between.
ETA: I had a look and, you're right, he doesn't mention this rule in relation to the contrast forms. Moreover, the text has mo chuidsa instead of (standard) mo chuidse, so this appears to be a genuine Connemara variant. I also found examples for Ulster and Scottish Gaelic. Looks like your examples were fine after all.
The rules governing use of these suffixes in the standard language can be found in Section 13.37 [p. 135-6] of this document (Gaeilge amháin, but you should be able to make sense of the examples) http://www.scriobh.ie/ScriobhIe/Media/Graimear%20Gaeilge%20na%20mBraithre%20Criostai_Eag1999.pdf. (Interesting, I didn't realise that mo chuid Gaeilgese was acceptable alongside mo chuidse Gaeilge. Also, nota bene: "Le focail dar críoch litir leathan a naisctear -na, -sa, -san; agus le focail dar críoch litir chaol a naisctear -e, -ne, -se, -sean.")
I'm not very familiar with Connemara Irish, but I assume the forms Ó Siadhail gives are special to Cois Fhairrge (and perhaps other Connacht varieties as well).