Sounds like they've been working well for you!
I know that efest has a reputation for inflating numbers. Why they rate this cell any higher than 30A is beyond me though. Its performance plummets above that. Looking at a 3.0V cutoff, as that's about as low as anyone goes...
30A = 2000mAh capacity.
35A = 1250mAh capacity, a huge drop indicating that the cell is being used way above its capabilities.
40A = 400mAh capacity, 'nuff said.
But, I guess they wouldn't keep on doing this kind of rating if it didn't result in sales.
Note: when vaping we're not doing truly continuous discharges and we'll get better capacity than the continuous discharge numbers indicate.