we can keep hp, cause current is fine, od aswell. (used this be4 https://osu.ppy.sh/beatmapsets/1919446#osu/3967484)
You might wanna low the OD cause the hard diff is already OD6 (unlike the map you linked which is OD8) to show more a spread progression
Update: lol the lower diffs have more HP than the insane and top (HP5 vs 4.4) what is this? taiko? lmao