In a very short time I've come to admire both your work and thought process. And I am trying to think through the essence of the problem you're dealing with, and I suppose that it's:
centralization V decentralization
This is correct. However...
or stating the same thing another way:
stability V accuracy
I don't think this is a good comparison. Especially since I would be basically selling the coin on the open market to force the price to be in a certain range, then the price is still accurate.
I would say, it's more like:
stability V freedom
If I'm controlling the supply of 1971coin, then you have to trust me to only release the coin at a specific rate to keep the price from rising too much, and buy it back up to keep it from falling. I would be the Federal Reserve for the 1971coin with the only difference being that my goal is to remove all inflation and deflation while making my formula for doing this as clear and public as possible. But, you still lose a bit of control and I would have at least some control over you at all times.
In the Stablecoin version, you don't have to trust me, just the code which you can see and audit at any time. The formula for keeping the price stable is written, not in stone, but in code. You can accept that law or not, or even change it to your needs (though you would be forced to use a different block chain). In the end, I don't have any control over you at all, and you always have control over your own finances.
...all of this leads me back to thinking that your darknet exchange is so important.
For this reason, my priority is the Dark Exchange. Even though I'm creating 1971coin, I don't want it to take much time from me bringing Dark Exchange to a point where it is useful and used.