Imp. Fireball and Imp. Frostbolt damage coefficient changes

[Quark]

Attacking this from a different approach. Take a BWL geared Mage (easy example to make up, one notable piece outside of straight stats is Touch of Chaos), and do as much damage as possible in 5 minutes. To skew it in the favor of the mage without the talent, grab Arcane Meditation instead of some +dmg talents. Ignored all crits and +dmg from talents, miss/partial resists as simplifications (they should favor both equally). Grabbed the mana cost reducing talents and factored them in. Ignored Clearcasting, Evocation, Gems, and Pots, and Buffs. Wand damage that both had not added into totals.

End results: With the talent, a mage can get 46095 damage in 295 seconds (35 casts), with an extra 15 seconds spent wanding (waiting for mana regen) for a total of 47325. Without the talent, a mage can get 49428 damage in 294 seconds (36 casts).

Thus, in the example that I can think of that best favors not having the talent, you lose 2103 damage over 5 minutes (7 DPS). Add in stuff to extend the life of the mana pool, like Seal of Wisdom (get more mana back while wanding), that'll be cut even further down if not completely nullified. The DPM part of the nerf is unimportant, the DPS part is important.

Chicken scratch follows, as I didn't feel like spending time organizing my notes:

Goal: Max damage in 5 minutes

Fireball (Rank 14)
465 Mana 35 yd range
3.5 sec cast
Hurls a fiery ball that causes 717 to 913 Fire damage and an additional 84 Fire damage over 8 sec.

Spirit Regen:

(13 + S/4) / 2

During combat - 30% regen (if you give up some damage to get Arcane Meditation)

6% less mana per cast
Crit gives 30% mana back

437 mana per cast.

6978 (+37 / 5 sec.)
Spell Crit.: 11.67%
Spell Hit: +5%
Healing Spells: +538
Spell Damage: +558

815 avg damage
+558
---
1373 avg (no talent)

1317 avg (talent)

218 Spirit
7000 mana

Regen outside 5 second rule: 33.75 + 7.4 = 41.15
Regen outside 5 second rule: 10.125 + 7.4 = 17.525

16 casts until out. In 16 casts, 48 seconds or 56 seconds
48 * 17.525 = 841.2
56 * 17.525 = 981.4

With talent:
Out of mana after 17 casts, or 51 seconds, or 22389 damage
Regen to full mana: 175 seconds, back to full at 226 seconds
17 casts, 277 seconds, 44778 damage
Regen to 1 cast: 292 seconds, 46095 damage
Extra wand damage (15 seconds more out of 5 second rule): 1230
47325

Without talent:
out of mana after 18 casts, or 59.5 seconds, or 24714 damage
Regen to full mana: 175 seconds, back to full at 234.5 seconds
18 casts, 294 seconds, 49428 damage