Use the 20% at Attack/Health (Champion Boost) and the 15% to Attack (Attack Boost). If you are worried, toss in the Greater Health Boost (25% Health boost). Otherwise, what other boosts do you expect to use beside the class-specific boosts?
I didn't use any boost in UC and my AA is 4* r5 max sig. I literally just stun, heavy and repeat. However, if u do see an opportunity for combo attack to ur advantage, go for it.
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I do stun and heavy attack. It limits his own combo and neurotoxin kicks in quicker.
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(30% if you have 2 venom and 1 Miles)