I'm working towards beating the Ender Dragon on hardcore vanilla Minecraft. I've gotten myself all the way up to locating the stronghold, however the End Portal is nowhere to be seen. I had 10 Eyes of Ender, and used up all but one of them to find the exact coordinates of where the eye ends up:
This is where the eye floats to when you're near the portal, meaning it triangulates on the Y axis as well. Thinking that it has to be nearby, I exploded a small stack of TNT to open the place up a bit:
It floats in the exact same spot, but there's still no portal nearby. It does not matter if I'm above or below that spot, it always floats to that exact location. Looking at the wiki, it says the PC version of Minecraft Eyes of Ender go to the exact coordinates of the End Portal, however I've dug all the way down to bedrock without any luck.
I seem to have exhausted all methods to locate the End Portal here. Is there a way I can still salvage this game without having to resort to cheating?
Edit: Here's my coordinates and seed as requested.