It's a concern we had in the past as well, but since there is enough time to react to the upcoming patterns it should be no problem at all. Overlap isn't too bad either since there are not many notes to begin with so it should be no problem.Maybe I didn't explained myself well.
1) This is a 3.2* Oni difficulty. The players will use this difficulty to get used to Oni difficulty, which will be Muzukashii players. Wouldn't they be surprised if they see these kind of overlapped notes? I believe they do.
2) I know the difficulties are made for nomod plays, but, consider about HD mode now. You say there is enough time to react the upcoming patterns. On HD, the patterns will be already gone before the SV change, which will eliminate HD players or, more commonly, HD DT players. That's a huge part of the taiko community that will try to play. Especially the new players who want to practice HD can't practice well on this map.
Because of these two reasons, I still suggest changing this SV to at least 0,9x like you did on the intro.