IMHO in flowering stage, anything that goes beyond 60% is highly risky, it should be between 50-55% as the top. A not very potent fan not pointing to the buds also helps to move the air and avoid to create humid microclimates that could cause mould or pests to appear. I live in a really humid area and finally had to buy a good dehumidifier too, once you’ve reached that stage no risks should be taken. I had to learn it the hard way, hope you won’t, good luck … 
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