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Prescriptions are the path of choice for a subset of the hobbiest community, we all agree on that. With all due respect, you are claiming a 98% purity is ineffective and that claim is a stretch by anyone's measure. If you believe that then you have to provide evidence that shows a 98% purity and 2% inert formula is proven ineffective. There are no such scientific studies that I am aware of.
The OP asked for suggestions. We hobbiests need to stick together and help each other.
There are no scientific studies regarding CP whatsoever, only anecdotal evidence. But you'd be hard-pressed to find anyone with more experience than me using Chloroquine phosphate over the past 7-8 years. I've used it on hundreds of fish with active signs of ich, velvet, brook & uronema. When using 99-99.5% pure CP in a disinfected QT I have a 100% success rate; meaning if the fish survives then whatever pathogen(s) were afflicting it never returns post treatment.
However, when you deviate away from that protocol (e.g. use something other than pharmaceutical grade, dose CP into a DT with rock/sand, treat in a long-term QT with biofilm present) - then results will vary. I don't want to see the effectiveness of this amazing medication being called into question because it's being used haphazardly. If that happens, then the hobby as a whole takes a step back as most will go back to using copper poison to treat their fish.



