I think newly generated compounds are all weird in Irish.

tosnaíod: this is present subjunctive. See ceannaíod in https://corkirish.wordpress.com/verb-co ... /ceannaim/capcut Of course, sara dtosnaíod can be sara dtosnód, as the future often/usually does replace the present subjunctive.

cáilmhar: having noticed dúilmhar frequently in PUL's works, I believe the -mhar ending to be always broad.