Don't worry about cya until your conversion is totally complete which it sounds like your isn't. Keep hammering it with bleach and keep the cl level at 15. You can make your drops based kit go higher if you dilute your water sample. Mix one part pool water with two parts distilled water, test as usual and then multiply the results by 3. That will read up to 15 which is where you want to keep your cl level during your conversion. By testing every 2-3 hours and redosing it with bleach as needed each time, I'll bet that your conversion will go quickly. Your TA is fine and your ph is OK at 7.8, but you don't want ph to go any higher.

Keep us posted how things are going!