This is a very tough nut to crack.

    "The major responsibility the team has is with initial ICO investors. That is how things are.
 ICO participants are the ones taking the biggest risk, and price is down like 95% for them.
 These are also the guys who can potential scale the project 10x in an instant."

I would have to politely disagree, the team has no responsibility towards ICO investor other than what was stated on the white paper. Implying that this is a secure investment doesn't hold any water. Investment and secure are an oxymoron.
While it is partially true that the investors have the ability to pump the price, miners are the one keeping the records in a decentralized manner in addition to providing mined coins to the investors. Unless investors are fine buying directly from the dev team's supply of coins and they would also keep the records for those investors! This is the definition of centralized currency
 
    "Like I wrote before, and as expressed by others already - it does seem a little unfair for miners. But mining is an open race. If you are mining GRFT to support it at a loss without selling, it's no different from devs & team coding without immediately liquid pay. You do it because you believe in the potential mid/long term."

Mining is not free by any means and if the team will chose to create a distinction in the coin holders base, miners vs investors, I can almost guarantee you that this project will go nowhere unless you become a centralized coin like xrp where you have no input whatsoever and where the dev team would do what they like with the blockchain. A centralized model crypto has proven to be the least liked in the community.
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   " A sensible miner will mine for profit, and if he so chooses buys GRFT. This creates positive price pressure, and negative on competing algos.  
 Even if mining at a loss, the -ROI is far far less than initial ICO investors.

 Plus, if the team were to airdrop to mined addresses... how to separate the opportunist miner from the truly supportive one?"

Then how to separate people that held the coin after purchasing it from the people that dumped it all at a higher value than the current one?