Actual sane hitsounds for Insane, along with everything Insane-related being applied.
Didn't really add any kind of SV changes to Normal since this would be an overkill for the difficulty, in my opinion. And as for the stack, it'd feel fairly random since I don't stack anything else in the entire difficulty.
As for the Hard, I've basically went ahead and applied everything there, except for 01:15:789 (1,2,3,4) - where I still keep the spacing since I feel like it works with the part and is readable due to the length of sliders.
Thank you, I appreciate your help.
Side-note, I also copied kiais and re-hitsounded stuff along with fixing a ton of whistles.
edit: brought back a bunch of 1/2 to balance the spread a bit.