...All 64 notary nodes combined are less than 15% of the coin production...
The whitepaper seems to disagree:
...Since the rest of the miners have an adjustable difficulty ratio, it does not matter how many more miners attempt to mine Komodo. Most of the valid blocks will always be found by the sixty-four democratically elected notary nodes...
You seem to forget that most of the coin generation is done through the 5% APR and not mining.
Mining Rewards per Year = 3x1440x365 = 1576800 coins
Estimated APR Rewards = 5 million.
So a little under 6.6 million coins produced a year.
Notary Node Approximate Year Income = 15000 KMD
(15000x64)/6600000 = 14.5 %