OK only 15 J15 flights per day, not so great. That's a lot of helo movements though.
I bet if we actually did a stock take of how many J-15s and helicopters are aboard Liaoning, the ratio would trend slightly in favour of the helicopters.
That's not because they're carrying more helicopters than normal, but because they're carrying less J-15s than its full normal complement of 24.
As I said, these excursions outside of the first island chain are probably not that useful if you're wanting to check what their maximum sortie rate are. These long distance exercises are more useful for practicing long distance CSG stuff that can't be as easily done close to home.