If you've had to do that much maintenance in so few miles I don't think the hubs are up for the job. My last 240 was fine evern after 10k miles and no service and require a single bearing replacement at that point.
I bought some chiner hubs last year and they were shite, looked good though mind you.
As far as i know there were also quite some riders having issues with ST Swiss 54 teeth Ratchet. It's just getting more sensitive to tolerances with rising teeth number.
The advice to go for 36T is something, that I also read and it did work for a ZTTO hub (it usually comes with 54, but they changed it to 36 for me). My Goldix hub does have a 36T ratchet, too.
The ZTTO M1 hub has 1000km so far, as no slipping happened so far, I will expect that it will work now until fatigue changes the situation. The Goldix 21H Ratchet has "only" 300km so far, I just finished the wheels very recently. No slipping so far.
My thesis: these systems may work very good for riders with low force on the pedals. (Either low power and/or high cadence ).. but being strong may immediately overstress the mechanic, which would then lead to an early failure.