Every safecoin farmed goes to the farmer. 100% of farming rate
You are trying to work it wrong. 5% of farming rate goes to core devs and 0 to 10% to app devs.
So for every 100 safecoins farmed 100 coins go to farmers, defn of farming. Then Independent of farmers every GET done on average gives core devs 5% of the farming rate figure and similarly IF and only if the GET is due to an APP then these contribute to 10% of farming rate for APP GETs goes to App devs.
Another way of saying it is that for every 100 coins farmed 100 coins go to farmers and and extra 5 to 15 coins are created to reward core development (5 coins) and for APP developers (0 to 10 coins)
But because coins eventually find their way to paying for resources then these rewarded coins are recycled to be used again.
Even the day one coins of 10% and day 0 to infinity the early investors will also eventually find their way to pay for resources. (Obviously infinitely hoarded coins and lost coins are excepted)
Your equations also have to be modified to account for the fact that the 5% for early investors are available but not given to early investors so do not dilute the value. Until the investors ask for the coins they are not in the coin economics and when they are given they become available to pay for resources by the investor or person who eventually buys them.
The recycling really makes the traditional market cap type equations an approximation at best and misleading at worse.
Another point to consider is that even though BTC supply is increasing at the moment the price is not affected by its increase in value.
On day one there might be 10% (& 0-5% investors) of max coin in the market place. BUT on day two there might only be 9% (&0-5% investors) due to massive storing on the network.
Thus you can see that the total coin existing can increase/decrease from week to week. This in itself will create dynamics in the trading market space that we have not yet experienced with any other coin.