Hi! 😃 I would suggest not to depend entirely on what you see on the Stat Pages, some of the damage boosts (and even damage reductions do not properly reflect in them). The best way to check your PvP damage would be to test it out on the AI dummy in the Practice Arena. For now, focus first on changing the Talents on your equipments as I have suggested (since we only need Citrine to do so and it's relatively easier to acquire it via drop than Topaz) also, let's try not to be hasty in removing affixes on your gear. Give the dummy AI maybe atleast 30secs of pounding using your previous build, exit, and then do the same with the Talents on your equipment changed as per my suggestion. Let me know how it would work out. 😃
As for the reduction of the affixes in the arena, I believe AMPLIFY 20 will be reduced to AMPLIFY 4 (8% damage for each Element DOT) and 30% Elemental Critical Chance will be reduced to 10% instead. To fully know the conversion of most affixes in the arena, check out this thread:
[List] PVP Stat Reduction.
Trust me, you'll love this thread the same way everybody who enjoys the arena did. 😃