5% fees look to me high.
It should be cheaper.
To become printing on demand, the fee should be optional. Like 5% fee for instant and 0 for 3,5% days ( or longer).
So pools can play out pumpers with 0% ( can be also 0,3%) and bring the price to 1$ and not close to 1$.
we will only become a stable 1$ coin if it becomes an automatic thing.
With the same mechanic that the stabilizer proposal does. With the difference, the profit will payed out as ROI. The scale would world in an unlimited way. But fees can kill the fun.
Also, increasing trading liquidity for HBD will discourage such attacks, because of the higher risk entailed to start a pump. But that's more of a long term thing to accomplish.
Long term I think a replacement with a DAI version / less complex would work better.
The initial mechanics were selected because they are very simple to implement, so the new functionality could be included in the upcoming hardfork. And 5% was chosen to be conservative: it should be sufficient to prevent any big swings in the HBD peg but decreases the chance for any gaming of the system.
After we've had a chance to observe how the new mechanism works, we can consider if further changes are necessary, including more complicated implementations.
Sure it's the easiest for the short/mid-term.
5% is IMO top end for a stable coin. Otherwise, the coin can become out of competition compared to other ones.
We need large Volume, the only way I see to abuse is a pre haircut massswap with higher swings, but there is a big random component also there. There is trading less risky.
So if we don't have a problem with a large amount of HBD, we should make it cheap to create them.
Maybe I will hold some too, because 3% also nice for a stablecoin.