full_up-qp said:the 50 was underdosed more than the 10 last time
What are you basing this statement on? Did you send samples from the 50ml and 10ml out for testing? If so, I would like to see the results. If not, please don't make statements based on opinion.
And please don't quote the "test results" from the QV website (although it shows 10ml and 50ml batches at the same strength). It would be naive to invest all of your faith in the test results promoted by the manufacturer.