The peg for HBD was supposed to be improved with Hard Fork 25, and for a while it looked that way.
Given the events since then (with HBD going as high as USD 1.20 or higher), a post-mortem of HBD's performance needs to be made to determine what happened beyond the scope of the algorithms so that the algorithms can take those factors into account going forward.
Algorithms are only as good as the people who create them, and creating algorithms isn't an exact science. It's an experience we can all learn from. Over time, the peg used by HBD will function better and better.
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