Enchanter epic being overwritten by Yaulp4 is/was a known issue... fucking hated it back in the day (ench was my main). I remember it specifically in Velious and can't be sure when it was "fixed"
That said, I never ever (other than only Kunark or perhaps pre-Kunark) remember stamina being an issue. In fact, once Velious came out I never ever remember having to address any issues based on someones stamina running low...
YMMV
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