When I got my KR805, I thought it grinds too fine for my V60 brew since I used quite coarser grind with my Lido-E. So I intentionally shift my knob to be able to grind coarser. But now on this new journey my grinds get finer and finer. My 4.5 will probably similar to your 5.5(edit: it is corrected now). And I can easily achieve 2:15 drain out ...
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