Short answer: No. Stick to using AGI/MAB in the waist/neck slot for Wildfire/Leaden. (or Obi assuming weather/day)
Long Answer: Assuming the formulas remains the same as posted by others,
Wildfire has a fTP mod of 5.5.
Leaden has a fTP mod of 4.0 (at 100tp).
Elemental Gorgets/Belts add 0.1 to fTP.
Floor means to round down.
For Wildfire:
[floor(5.5 * (Lv + 2 + floor(0.85 * floor(AGI * 0.6))))] + [2 * (Your AGI-Enemy INT)]
Leaden Salute:
[floor(4.0 * (Lv + 2 + floor(0.85 * floor(AGI * 0.3))))] + [2 * (Your AGI-Enemy INT)]
Let's assume your AGI = 150. Enemy INT = 100. Two scenarios, one with Gorget, and one with MAB+8 (uggy)
Firstly, with uggy:
[floor(5.5 * 168)] + 100 = 1024 * 1.08 = 1105
[floor(4.0 * 136)] + 100 = 644 * 1.08 = 695
With gorget:
[floor(5.6 * 168)] + 100 = 1040
[floor(4.1 * 136)] + 100 = 657
Generally the only time I use gorget/belt is if I'm brewing, as I don't know how much MAB it adds exactly.