Winter

I feel like for a more serious ranking system there would be no bonus at all but for user experience, I would say it's fine however 400 is a lot...

could you make it so we lose ranked score if we get less score but more pp that would be fine with pretty much everyone since not many people care...

If you are using a different mode you must change to that mode in order for it to update your ranks, or else it won't do anything.

What mode do you play

If you switch to the taiko mode it should work 

https://osu.ppy.sh/help/wiki/Skinning/osu!taiko My skin has no kiai effect so maybe you can go through the skinning wiki to see what elements cause this