Offset needs +12. If you're wondering why SS scores are all early (like basing an offset on that is a good idea), it's because the song is slow. 200 BPM single tap is very slow, especially with density as low as you have it in the map. People tend to click this too fast, especially when it goes with large spacing.
Also, the hitsounding could be improved. First and foremost, you don't follow the basic drumline of the song.
Here's what you have:
Here's what the song actually does:
You may think it's small, but this additional kick bothered the hell out of me every time I looked at this. Please do fix this. I assume that you did this on purpose and you're creating your own rhythm with the hitsounds for the kiai, but I don't think it works. This additional kick simply ruins the whole hitsounding to me, which other than that is decent.
Second big issue: this tick sound is extremely intrusive on (technically) overmapped objects, mostly sliderends. Note that I have absolutely no problem with those objects being sliders, but the fact their end has that strong hitsound is a bother. If you want your map to sound nicer, you'll need to find a quieter sample to substitute to the objects that do not follow directly the piano. Also, you're wasting the whistle sample with the double tick thing, when you could have used it to follow the hi-hat which would have been a nice addition to the hitsounding. If you find a quieter sample, I'm willing to redo your hitsounding for you in the Camellia diff. If I were you, I would keep the tick sound as a whistle and use it for hi-hat, but if you want to use it to highlight the piano, that's fine.
Third issue: the hitsounding's structure is lacking and not following the song's.
02:12:197 (1) - The drumline restarts at a fairly audible level around here. Yours starts here 02:17:597 (3) - which doesn't make any sense. For the sake of structure and how you decided to structure the map, I'd advise to restart the drumline only later, at 02:21:797 (1) - which is the point where your map accelerates again. It would be more consistent with your structure and the acceleration would work better that way.
02:36:197 (1) - Same here. Don't switch the sample this early, it doesn't make sense. It ruins the potential hitsound change effect you could have to emphasize the kiai. Keep the louder samples for the kiai and use the quieter ones there. Also, 02:38:597 (1,2,1,2,1,2,1,2) - most of these kicks don't exist in the song. And again, before you say "I want to build up to the kiai", the violin takes care of it, not the drums. This is intrusive.
I would have liked to see the end mapped, if only to have a calm, soothing ending, but that's up to you. There are many things I could point out in the map itself too, but they're purely stylistic choices and I have no big qualms with how you mapped this. If you're curious, I can post them, but I don't consider them critical and certainly not worth DQing over. The rest of what I pointed out, however, I do consider worth a DQ.
