Guardian Druid's read of the whisper was the Ula'tek trinket and the Zul'jin weapon. In game those are Voracious Heart of Ula'tek, an on-use trinket from Ula'tek, and Maze-roa, Warlord's Fury, the two-handed axe from Coiled Altar. Maze-roa is half of the Bite of Zul'jan set. The other half is Zul'jin's Guillotine Technique, a trinket from the same boss. SimC models all three, set bonus included, so the rows below test the axe alone, the set, the Heart, and everything at once.
The base is the gear you wore in this key, read from the log at 13:10, with your talents (unchanged since 10-04). DungeonSlice, 6 minutes, 10,000 iterations a row, local SimC. Row 00 is your gear again under another name, so its distance from zero is the noise. Rows closer than about 0.2% are a tie.
row full buffs Bloodlust only
00 control (your gear again) -0.04% +0.06%
All three at 334: Heart over Hoof, Guillotine over Vial +4.03% +4.24%
All three at 334: Heart over Vial, Guillotine over Hoof +3.96% +4.19%
Maze-roa + Guillotine at 334, Guillotine over Hoof +2.53% +2.57%
Maze-roa + Guillotine at 334, Guillotine over Vial +1.98% +2.25%
Maze-roa alone at 334 +0.69% +0.80%
Heart at 334 over the Hoof +0.68% +0.64%
Heart at 334 over the Vial +0.54% +0.73%
Heart at 318 over the Hoof -0.28% -0.14%
Heart at 318 over the Vial -0.32% -0.37%
Maze-roa + Guillotine at 318, over Hoof -3.26% -3.07%
Maze-roa + Guillotine at 318, over Vial -3.63% -3.37%
Maze-roa alone at 318 -3.47% -3.49%
Your gear (the base), simmed DPS 262.9k 224.2k
With everything at 334 you gain about 4% with full raid buffs and 4.2% with only Bloodlust. In this key's terms that is about 10k a second of your 250k per fighting second, against the 53k the hunter was ahead. All of it together closes about a fifth of the gap, and the held Wings and the opener cost you more than the missing items did.
Most of the gain is the set. Either item alone is worth well under 1%, about what your boots craft was worth on 10-03 (+0.49%).
At the item level they'd drop for you, they make you worse. 318 is what a Heroic Voidcore pays (from the 09-22 vault notes). The Maze-roa rows at 318 lose 3-4% because your current two-hander, Malignant Toothed Edge, is already 334. Getting there takes the drops (a Coiled Altar Voidcore is a 1-in-5 roll among Ret items) and 80 Myth crests per trinket. Per the 09-22 notes the axe upgrades for free on your 334 two-hand watermark. If you ever get both Coiled Altar pieces, they're worth wearing. Neither one is something a Ret needs to be good.