BfB: 20% boost for 20 seconds every 80 seconds.
IR: 20% crit boost for 15 seconds every 60 seconds.
Aero: Net potency 200 (lowest DoT available to us aside from Miasma II; replaces 1 Ruin compared to typical SMN routine so net +120 potency usually, 325 potency if under Contagion)

Energy Drain does not make the loss of Fester insignificant, don't kid yourself. Still net -450 potency per Aetherflow.
Emerald Carbuncle's Gust is 90pot vs Garuda's 100 on Wind Blade. Couple with the loss of Spur (40% for 20s every 2 minutes is not as minor as it seems) and reduced INT compared to SMN and I honestly believe this is a wash.

Here's some napkin math of just BfB+our available DoTs (relative to a SMN, just considering potency and ignoring Raging Strikes since both get it)
*Reminder that all DoTs tick every 3 seconds, so net potency is Initial Potency + (DoT potency x [DoT duration / 3])

Bio II: 420 (+70)
Miasma: 360 (+60)
Shadow Flare: 300 (+50)
Bio: 288 (+44)
Thunder: 288 (+44)
Aero: 240 (+40; technically +240)
Miasma II: 84 (+14)

Excepting Miasma II since there's little point using it single-target, the net potency gain is 522 (282 if Aero is not counted). If we also consider the potency drop from Wind Blade > Gust (10), across say 18 seconds (duration for many of our DoTs), that's -60 to our total. So more like 462 vs the 450 you "lost" from Fester.

You would have a pretty killer Contagion and that would probably make this worth considering. But it shouldn't be an immediately obvious vote and Allagan book is far beyond the reach of most SMNs or would-be ACNs yet.