That is a bit hard ofc, but here are my thoughts.

If you have the same amount as the white paper says as reward, it is a risk that the wast majority of the coins that are in existence are from the mining. That will likely scare of many investors In the ICO, since they will not have a big part of the coin supply. And the key here to my opinion is that this is Not MNE, that was an airdrop, in ARTEMINE, people actually pays to get this coin and have value.

If you lower the reward, then the supply in the beginning will be increased by the public mining, but not in any numbers that would scare of investors. Furthermore the price point is more in line with the supply of the coin in the early stages. I do also think that the Gwei cost will become Lower in the future, since the network is growing, and will evolve.

Lastly, I do think that the public mining is impossible to have as a feature that will be used in the long run, it will be used in the beginning when the supply is low, and in the future when the price is higher then the cost of the mining.

So, I think the idea to lower the reward is a good idea!