Are my maths mathing?
In testing this mod with default settings, I put a Legendary Quality 3 module in to give me 6.2% and didn't seem to be getting very good results, so I spawned in 10,000 Common Quality 3 modules, put them in a box and fed them into the outer of the condenser.
After it had finished I ended up with a staggering 4x Rare and 2x Epic. I ran the experiment again and got 3x Rare and 2x Epic.

I thought I'd try a different item and put 5,000 common Assembler 3 in, and got 1 Rare and 1 Epic.

Surely that's not right?

Edit
I went through the settings and added the planet-discovery-fulgora=10,planet-discovery-gleba=10,planet-discovery-vulcanus=10,planet-discovery-aquilo=20 into the technology line, now after running 5,000 Assembler 3 I got 499 x Legendary with no others.