Because of Dan's recent post, and discussion a few days ago by other witnesses who were already doing it, I have adjusted my feed by 10%, and put this into my steemfeed-js script, where it is now enabled by default.
@dan's post @dantheman/boost-steem-value-by-backing-steem-dollar
By reducing the price feed by 10%, it allows for up to a ~10% drop of STEEM price during the 7 day exchange before you start to lose out on the 1 SBD = 1 USD smart contract.
This percentage may change over time, depending on how much the market is fluctuating. If the market fluctuates more heavily, this percentage may go up. If it becomes more stable, the percentage may be reduced.
Other witnesses doing the same (by looking at the difference between the SBD price on https://steemdb.com/witnesses and https://value.steem.network):
There are most likely other witnesses doing the same, this list is not complete, but just a few examples of other witnesses following through with some form of reduced feed peg.