Thanks for the warning. But before we start a panic, I think we need to qualify “not hot.” Seattle’s daytime highs in summer are 69-75 F vs 73 - 84 F in Providence. Highs here are generally around 80 F.
I don’t have the problem of astringent PCNAs here. I say that after eating dozens of IKKJ over many seasons plus 2-3 Taishu this year. Also there’re some Izu on the way.
My takeaway is that we don’t need temperatures 85 - 100 F to remove astringency from PCNAs. It seems that 75-80 F is warm enough.