I'm not an archer, but I usually keep my health set to a quarter inch under 100%, my stam is about 65-75%, and my mana is ~35-50%.
For my melee, I usually keep my stam much lower, in like the 25% range just to keep from chugging rations all the time.
This, however, has proved interesting... When I go to buff, I have to move the stam slider up to keep from S2M chaining because the stam drops too low while buffing. I've considered adding a 2nd stam slider to only be used while buffing.
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Don't blink, Don't even blink
Blink and you're dead
They are fast, faster than you can believe
Don't turn your back, don't look away
and don't blink.