After one attempt that ended at Curse of Vlad Tepes and two that ended at the nonspell right afterwards, I finally managed to 1cc EoSD normal! When I went into Red Magic 2/1, I knew that nothing could stop me, and I finished 1/2 in the end. Captured Red Star of David and CoVT along the way.
I also was about to perfect stage 5, but then I decided to choke (read: die) on Sakuya's last non and managed to waste 3 bombs on her last, oh well.
I have suspicions that I have played more EoSD in the last two days than I have ever before (not really), but at least the concept of having no visible hitbox isn't thaat alien to me anymore (the bullet hitboxes suck, though (curse you, Undine!)).
I peeked at the extra stage for a bit and Silent Selene alone is better than anything that Ex-Kogasa has to offer.
Since 1cc'ing IN 6A isn't that migh up my priority list, I now have the choice between completing the 5 extra stages I haven't beaten yet, trying other shottypes for normal, or starting hard. Seems IN is a good choice if I go with the latter, but extra stages are more interesting atm.