The chemical Tri-Chlor IS stabilized by its very composition and you should not use it with your CYA of 60. As Tri-Chlor releases chlorine, it also releases CYA (stabilizer) .Plus Tri-Chlor is highly acidic so you shouldn't use them because your pH is 7.2

Bottom line: You should not use pucks in your pool at this time and probably not for the rest of the season.