I'm still wondering about the default % of these two, is that seem ok for the index ?
Force settlement offset 1%
Max force settle vol 20%
If I was too guess, I would think you might have more people willing to go long than short, so you would probably want to offset that with settings that are more favourable for shorters. A force settlement offset of 5% should be more positive for people shorting the index as they would be less worried that they are going to be force settled against unexpectedly. I think, I'm not sure about that though.
You can't fake volume very easily/for very long when you're paying 0.2% per trade can you?
except you are the exchange owner... so the fees come back to you...
That's why I first consider the MC, because it's the only thing you can't fake. The only way to manipulate the MC is by pouring your money in the coin ;p
A lot of cryptos claim to have X supply on the market but you can't be sure they really distributed them, so their market cap is inflated but this is often obvious by their much lower volume.
(As an extreme example, have an ICO for 100 million coins, raise 100 BTC but 99.9 BTC actually came anonymously from you. Now there's only 100 000 coins on the market you don't own. Building their price up to $1 a coin would be fairly cheap and now your DAC/Coin would be valued at $100 million, but it would be clear your market cap is inflated because of the low volume.)