Yes, keep using dichlor until your CYA level is around 50ppm or so and then switch to bleach.
Your CH is fine and since it is a liner pool, this is not a test that you need to worry about. In a vinyl pool, CH is only a problem if it is high.
The TA is ok at 50 but it may help your pH to be more stable if you increase it a little with some baking soda. Aim for 80-100ppm. Add a couple of pounds, and then wait several hours before you retest and add more if needed.
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