Since I don't want to double-post in the rage thread...........
ISC 4-3, 1313 attempts and still no capture.
HOW HOW HOW do you guys all swim through those butterflies like it's nothing. I just can't do it. I always get clipped. It's impossible for me to kill it in two waves because I just really really can't dash through all the butterflies and get to shoot the boss in time. Seriously what's wrong with me. Why am I so bad.
ZUN I hate you. Why do you make it so that you can't move to the top of the screen. WHYYYYYYYY. WHY do you make it anime flashy cherry petals over those butterflies, as if they aren't flashy enough already, just so that I can't even see them. WHYYYYY
ISC 10-3, how do you dash through the red balls so fast? I just can't..................... I just can't..........................
This is just so HORRIBLE. I feel like I'm not fit to play Touhou and I should just quit. Clear ISC in 18 hours? 60 hours? HA. At this rate I will never clear it even after 500 hours. I can't even begin to fathom how to dodge the clipshit that is 10-5. Some of you said consistent at waves 1, 3, 4? HA. I can't read 2, 3, 4. I can't make the 0.000001 milimeter tap. I just caaaaaaaaaaaaan't. I'm just so bad. Lunatic 1cc in every other game feels so easy compared to this. SFN timeout with Youmu Solo? EASY. VoWG timeout? EASY. None of them took 1300 attempts. NONE.
Well, you don't HAVE to finish 4-3 in 2 waves... you could try to take the risk and dodge 1 more, and safely kill Yuyuko after (I would personally just rush and kill her ASAP, but that's just me).
And yes, the fact that you cant move to the very top of the screen is absurd. I do remember it begin VERY annoying in that one scene, because I felt like I was able to actually dodge an incoming butterfly, only to find I have apparently hit the top of the screen... even thought I am not that close to it :/.
10-3 is slightly more doable if you try to lure the laser into a certain way... I would link my own replay if ya want but I am a n00b who has never shared replays IDK how to upload them...
10-5... Well yeah that one is just plain HARD. No excuses there. For some reason, it MIGHT seem like its better to go with the normal shoot than the Cursed Doll shot in this one scene (Not 100% sure though).
And finally, I know its cliche, but I don't think its a good idea to compare yourself to others... we all have difficulty in different stuff. I have cleared the entire game with no Items, yet all of the stuff you said there (Including apparently having all Lunatic 1cc- I barely have 2 under my belt because the rest are TOO HARD for me ATM) just seems unreasonable for me, to say the least...
One more thing... I know its tempting, but I would personally try to focus on as few scenes as possible (Around 4-5 Max). Because you know, practice/memorization. You may just clear one of those earlier than if you didnt focused on any scene in particular, and its just a good feeling to clear them, giving you motivation to continue clearing and so on

EDIT: Edited "Yuyoko". I don't know why I seem to ALWAYS misspell her name as "Yuyoko". WTF.