Here is something to work on:
Frost Bomb formula is: 4600 + (344.68% spell power) to the main target.
Assuming 54,000 Spell Power during burst: 4600 + (3.4468 x 54,000) = 190,727
Add x1.72 (Mastery modifier) = 328,050
Add x1.2 (Arcane Power modifier) = 393,660
Add x1.15 (level 90 talent modifier) = 452,710
Add x1.56 (PvP Power modifier) = 706,227
Add x2.03 (Crit modifier) = 1,433,642
Add x0.2 (PvP Resilience modifier) = 286,728
Add x0.70 (nerf to Frost Bomb against players) = 200,709
This is very close to the numbers I've been getting on my Mage back in the day.
krischyn, Vatfaker, Can you upload another test that shows your spell power, pvp power and mastery during burst, and also the damage that your Frost Bomb did?