The EL wiki lists the following for the Fire Arrow.
- 15 normal damage
- 35 heat damage
- -30 Defense
- -25 Accuracy
- -10 Missile Accuracy
- -15 Critical to hit
Im not positive how damage is determined by the arrows, but assuming that every 5 ranging levels grants +1 dmg and +1 accu, (and by doing a rough estimate based on my max damage with elven/training arrows) I would guess the training arrow does around +5 normal damage. I never did much ranging in EL but it would seem that the fire arrow is quite OP, and therefore maybe not suitable to OL without the higher end CoL / Rdholam. Could their stats be modified? It would be fun to at least do some testing with them, to determine if they needed to be nerfed.
Hope this isn't a selfish request, feel free to tear the idea apart