I managed to clear SP-9 on Double Spoiler with less than 1000 photos.
Took me < 100. Isn't it just keep charging as fast as you can and make sure every photo you take catches Aya? Hatate's charge time is so short that you will take another picture before it gets too dangerous (although luck is involved).
My first ever 1cc
First of all, congratulations on your achievement, although for IN, you should also beat Kaguya.
I quickly watched the replay at 240fps, and I noticed a couple of things:
1. you seem to bomb right after you die for some reason, I would advise against doing that
2. sometimes you don't need to dodge that high up or move very much at all, For example...
2a. Mystia's cards, you can get by with little movement and staying at the bottom of the screen
2b. Marisa's 2nd card is very easy if you stay at bottom center and use small movements to dodge the waves as they come.
2c. Marisa's last card on easy can be captured by standing still, and on other difficulties by very very easy streaming; I don't know why you are moving around that much
3. You don't have to dodge any bullets in Reisen's last card - just move up above the 2nd ring of blue round bullets when most of the bullets are hidden. Her first card is similar, just move up to a gap, and move down with the bullets, no dodging necessary.
4. You seem to have trouble with stages and non-cards, I'm not sure why.