The grain size is small enough. and you appear to be pouring upside down (thumbs up). I think all along it was only the vibration. You may have a breakout. Hard to use last pour for a volumetric comparison if the mix ratio changed. Yeah, I hope it went well.
Weighing and adjusting for temp/ph is also key. These control the chemical reaction and thus the end result.
'Trial Of Thunder (5-3)' from the 'Crypt of the Necrodancer' (Metal Soundtrack). I'm not a fan of this type of game and have never played it, but Familyjules totally shreds the original 8-bit soundtrack it had.