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I wouldn't recommend a 40% water change normally. But this is not a 'normal' situation. You are adding chemical medication daily for 7 days.

It seems a bit unlikely that it would be a bacteria infection if one group are unaffected in the same tank. Was the supplier a reliable 'shrimp' source? It may be worth getting some new shrimp from somewhere else, even if they are low quality cheapies as a trial, that would give you a bit more to go on??? I would have expected even the blue bolts to get sick if it were a bacterial infection??? I can't advize on the treatment dosage, but hopefully someone else can! I still have 10 chilli rasbora doing well in that old TB tank so it is still being used, the killie died after about 1.5 years, but that was to be expected and nothing unusual.