Here's a small mistake: the beatmap's BPM is actually 180.86 , not 180.96 , the beat wave chart in the osu!lazer editor proves this. So the closer you get to the end, the slower your tap will be
I also agree with this, but oh no, after realizing that all the other Granat maps had the same BPM deviation, I didn't take it seriously anymore, even so people still farmed the map and got pp just fine, strangely enough. strange of BPM