Sorry it's taken me so long to read this, it is absolutely incredible work. Thank you so much for sharing it!!! If I'm not mistaken, this would have cost you around 9,000 ironite?!?

Rather interesting results too. My own limited testing had suggested Stage I was the "best" level when it came to the 1* yellow and purple evo runes, but it might be fair to say the drop rates are so horrifically low it's difficult to say anything for certain about them?

Hope you don't mind, but I played around with your numbers a little to see if any obvious patterns jumped out. By far the most interesting thing I found was looking at the each colour of rune as a percentage of all rune drops of that star level. This relies on the assumption that star level and colour are separate RNG rolls, but it feels like a safe assumption given the results. I ran it with both your Per 100 SoT and Raw Drops, just in case, but there wasn't any significant variation between the two variations.

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Interesting to see how closely the Green/Yellow and Blue/Purple percentages matched each other, and how the colour distributions flipped so dramatically between 1* and 2*s. I'm inclined to believe the loot tables for the Gardens of Life and Dismay are identical, with only the colours changed between them. The Garden of Fear has a more consistent split between the red and colourless runes however, which makes me think the incredibly lopsided colour proportions found in the other two dungeons is a bug, rather than a weird intentional design choice.