On average you can use 1 stack of Aetherflow per rotation and you can use Ruin/Ruin II about 3 times between DOTs every rotation. Pet Potency doesn't work exactly when compared to Character Potency DMG isn't so easy to calculate. For example Garuda's 100 Potency attack is about 70% stronger than Ifrit's 120 Potency Attack (not including Ifrit's Auto-Attack). However Ifrit's 120 Potency Attack + Auto-Attack = Garuda's 100 Potency Attack (no Auto-Attack available).

Bio: Potency 40/tick Duration 18s (6 ticks) Total Potency = 240
Miasma: Potency 20 + Potency 35/tick Duration 24s (8 ticks) Total Potency = 300
Bio II: Potency 35/tick Duration 30s (10 ticks) Total Potency = 350
Thunder: Potency 30 + Potency 35/tick Duration 18s (6 ticks) Total Potency = 240
Shadow Flare: Potency 25/tick Duration 30s (10 ticks) Total Potency = 250

Energy Drain: Potency 150
Fester: Potency 300 (max)
Ruin/RuinII x3 (w/Thunder) and x4 (w/o Thunder): Potency 240 and 320