That's quite a difference in your CH reading, any idea what happened there? CH is not a fast changing parameter.
You seem to be using the 25ml test for CH with 10ppm resolution. Fir CH, 25ppm resolution I'd enough, using the 10ml sample test will save you reagent.
For TA, the 25ml sample test is right.
Trichlor is not evil as such, as long as it's used in moderation and the pool owner understands the consequences. Just be aware that with every 10 ppm of FC, you are also adding about 6.5ppm of CYA. It can add up quickly.