The first time I successfully shinesink clipped was yesterday on my Dread mode run. i didn't have the diffuse beam back then so after fiddling for about an hour or less, I gave up, restarted my save and headed back to Kraid.

Now that it's done however, I spend half a day trying to redo it, WITHOUT ANY SUCCESS. https://drive.google.com/file/d/191jjUNWmPPDwu4L1b9_ly4iZVyhZd4vx/view?usp=drivesdk So naturally I tell myself "huh, seems like I just need practice" So I boot up my 100% Normal mode save and go on that spot on Hanubia... But now I can perfectly do it over 50% of the time?!

Load Dread mode file, Spend another half a day, NO RESULT. https://drive.google.com/file/d/191XvW61L3swivl3rXOSIMWY8zreED9H-/view?usp=drivesdk https://drive.google.com/file/d/1957s53iJAPNsoEIDMtMBo_6OaM59kGI6/view?usp=drivesdk Try to find other spots to perform the clip, INSTANT DEATH. Load 100% Normal mode file, teleport to Cataris, FIRST TRY?! https://drive.google.com/file/d/191lr3RAqqvz2543dhRQ5Uwzrk0GKbknv/view?usp=drivesdk

At some point I even thought "oh maybe it's those revealed Power bomb blocks that act like a wall inside the floor? But my 100% save file has them all revealed and no problem there.

At this point I have no Idea. I have the confirmation that I can consistently pull off the shinesink clip, but the OOB threshold in Dread mode seems like it's buffed for some reason. I can't find anything else with that issue on the web and I figured here would be an appropriate place to ask.

Shine sinks shouldn't be any different on different difficulties as far as I know. Are you doing them in the same place with the same set-up? Different "one tile" floors can be different levels of thickness, and the grapple angle can also make it easier or harder. If you're new to shine sinks as well they can just be incredibly inconsistent at first, and maybe you're just experiencing some placebo.

We could somehow record you inputs while in normal mode and use the tas functionality of yuzu to try inputting that in the same spot. Then we can know for sure.

[SOLVED] Ok so first of all, thank you for your responses. Second, the last "first try" I did on my 100% save was a lucky one, this morning I couldn't do it anymore. The placebo I had was definitely gone at that point.

Once I realized the Cataris Shinesink is absolutely harder than Hanubia's, I started to deconstruct each video I recorded and compared the results for failed and successful attempts, and it's only a few hours ago I discovered I that Samus died each time as soon as the grapple hit a surface. On my successful attempt, the grapple hit the top right corner (the furthest point) of the room, and I remembered that one very specific moment in a video where it said that the grapple was what kept you alive while OOB, so it makes sense that hitting a surface early would let the detection kill you.

Once I confirmed my thoughts looking back at the previous locations I failed (tight spaces) and watching a speedrun performing it, I began working on my muscle memory, trained to aim at that specific corner again and again, then around 30 minutes, this happened https://drive.google.com/file/d/19WwzwGbyVRLAomm1hqqondV9xmTCFJrl/view?usp=drivesdk

That's it! I did it... Now only one more clip and I can obtain screw attack early (oh f*** the timing is tight)

I was getting discouraged because I didn't know what I was doing wrong. No tutorial ever points out that detail on Cataris and they all use Hanubia as a training ground.

So I'll try doing just that, a video pointing out how harder Cataris is and then I'll start training on Artaria's Shinesink clip for screw attack (definitely will help on Dread mode :)

For starters, I recommend learning the pause buffered method for SSC. Makes it a lot more consistent, IMO.