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MelkorX
Should clarify, I meant 50 focus after Marked, so 80 focus.
80 - 30 (marked) = 50. 1.5s GCD from Marked = 15 base focus (65 focus total). Arcane Shot 1.5s GCD = 20 base focus (10/s + 5; 80 total). Aimed Shot + 2s GCD (80 - 50 + 10/s = 50 focus total). Aimed Shot. Vulnerable ends. The math doesn't account for haste, but since Focus regen, GCD reduction and cast time reduction scale close enough to linearly it should hold up in the rest of the rotation regardless of haste.
Vulnerable window (6s) with the above rotation):
1.5 Marked GCD + 1.5 Arcane Shot GCD + 2s Aimed Shot Cast + 2s Aimed Shot cast = 7s. With 14.2% haste (very difficult not to already have) this rotation guarantees the last second of Aimed Shot in the maximum DPS window assuming no latency issues.