03:39:549 (219549|2,219549|3,219638|2,219638|1) - This both note I feel like somehow not worthy for double as they're not deep or strong snare and only feels like a light snare that only worth for 1 notes. It's different with 03:40:176 (220176|2,220176|3,220265|3,220265|1) - because these 2 notes have more strong snares that worth for 2 notes.
Also 03:40:265 (220265|3) - shift this to column 1 for hand balance because you already heavily impacted to pattern into right hand from 03:39:459 -
03:41:071 (221071|2,221071|3,221161|3,221161|1,221340|3,221340|0) - These note also count if you accept the mod
in this part, my idea is:
if is kick drum sound, put single for it.
if is snare drum sound, put double for it.
if both have drum sound and melody sound, use double for it, either is kick or snare.
the drums you point out is all snare sounds, according to my idea, there are should be double.
04:15:011 (255011|2,255055|3,255100|2,255100|1,255145|0,255190|1) - This type of structure is thought to be too harsh in the 335bpm stream. I think it's okay to change it to a more comfortable stair pattern.