CH:350?, CYA:65? FC: 2?You should now ONLY be using bleach or liquid chlorine.

HTH (cal-hypo powder) will rapidly push your CH over 400--the max recommended for plaster/concrete pools.

Tri-Chlor tabs and Di-Chlor powder will push your CYA up which is ALREADY very high at 65.

FC is far too low and NOW needs to be between 5 and 10ppm just for maintenance.

You are still within normal, recommended ranges for everything (but your low FC). But I would STRONGLY recommend you stick with bleach/LC given your CH and CYA numbers.