AC certainly does have a higher operating cost than most other carriers. Higher tax country along with all the extra "winter weather" expenses that someone like UAL / DAL wouldn't have to spend as much money on. With that said, WJ's 15-25% pay raise would serve as the floor now for what AC Pilots want and I expect anything less than that would not help in reaching a deal early and probably even make the job action worse.
AC is cancelling 30-50 flights a day for "Crew Constraints" and it's not even summer peak yet, I fear we're in for a lot worse the rest of this year.