Here's my setup.
Rune-stone for Fire:
Majors:
Fire-type damage (max out)
Wrath of Flame Damage over Time (max out)
Battle-Attuned Power Cost legacy (max out)
Minors:
Distracting Flame cool down
Finesse (no points unless you have nothing better to fill in)
Will (no points unless you have nothing better to fill in)
Fate if you use a crystal of remembrance (no points unless you have nothing better to fill in)
Rune-satchel for Fire:
Majors:
Essence of Flame Damage (max out)
Writ of Fire Damage (max out)
Self Motivation Cooldown (max out)
Minors:
Smouldering Wrath Power Cost (max out)
Remaining debatable. I use Shocking Touch Resist Rating (no points into it) and Word of Exaltation Cooldown (max out) for the last 2 bag legacies. Argument could be made to do Will and Fate again.
If Dadi wants to chime in on yellow-line, he's much better at it than I.