Yeah I don’t recall Seether being much a force on mainstream CHR. Adult maybe and maybe there was a market or two where a mainstream played it for a bit but it was never a force on the mainstream charts.I remember Rise above this by Seether charting in '08 and that song didn't seem female-skewing. Edit: looks like adult top 40 chart, but Mix in kc played it.
08/09 the format hit a low point compared to its performance in the earlier 00’s. CHR hits cycles where a given audience that interacts with it ages or shifts in its habits and tastes and things have to ‘reset’.
That end of the 00’s period was right before the EDM and Rhythmic resurgence in the 2010-2014 period.