None of the ones I tested were that low. What tester did you use?
It is in his linked thread with some cloud link to it. It appears like the cells were actually tested combined together in series as a "12v" battery
Not sure what his "average amps" mean either but if it means it was charged/discharged at much higher current than yours are, that'll easily be a 2 amp hour difference. Slower you charge the more amp hours you can get in a battery though it may take days extra for only a few more amp hours on the ratings.
Nobody in that thread even notices it lol
This is a constant watt test, so the amps go up as the voltage goes down. This will easily give you several amps different in your tests vs a good tester with good settings.
their cloud tests are in series which doesn't really give you perfect idea of the cells either.
Test method:
Charge to 3.62V with 40A, 5A cutoff
Discharge to 2.52A with 40A
See they don't have this, theirs is more like:
charge: 3.65 60 amps and 60 amp cutoff
discharge: 50-60 amp with same cutoff
@EastFalcon I estimate your batteries to get a 280-282 amp hour with the same test that OP does, at the same temperature.