Last time I checked (I could be mistaken), the input was the same (10) but the output was much higher which is why I thought something might be wrong. I just updated the mod though and seems like the new one (0.2.2) is crashing due to the error below so not sure if that was resolved or not.
"Failed to load mods:omnimatter_compression/data-final-fixes.lua:3:omnimattter_compression/prototypes/compress_recipes.lua:402:attempt to call global 'find_stacksize' (a nil value)"
Edit: New updated library I saw you just released seems to have fixed the mod failing to load. Thanks for the update.
Edit2: Recipes for omni extraction still seems a bit of a mess.
Basic Impure extraction: 10 in, 2, 2, and 6 crushed out
Focused 1: 10 in, 3, 2 and 6 crushed out
Focused 2: 10 in, 4, 3 and 6 crushed out
Focused 3: 10 in, 5, 4 and 6 crushed out
Ore extraction 1: 12 in, 8 and 8 crushed out
Ore extraction 2: 12 in, 9 and 9 crushed out