Ah, yes, well... The MMM conversions are worth crap. The guy has a thousand vids of customer converted engines, but YT vids of engines fitted with his conversion kits in actual flight are rare, far and few inbetween. He indeed recommends IMHO irresponsibly low oil rates.
I have re-done two of such conversions, both times the owner told me I could keep all the crap I pulled off the engine (which I didn't, what am I supposed to do with it?)
Believe it or not, one of those engines was initially modded by me (simple carb groove mod) and ran fine when I delivered it. Owner never flew it because "it didn't look nice", bought a MMM mod for it and sent me back the carb that I modded.
Back then, like today, I did those mods for free, only materials used.
Then he found out that his nice looking but expensively modded engine now ran like crap, so he shelved it for a year or so before giving it away (unknown to me at the time) to another guy that eventually contacted me if I could have a look at it.
After some back and forth talk, I figured out the history of the engine, realized that I still had the carb originally belonging to the engine and told him it would be a 10 minute job to fix it. So he brought it over, and left an hour later (test runs take time) with a happy face.