Farming or fighting in early?

Even if I win enough games I have a very bad time with farming. I play most Vel'koz and early until min 15 (when is my power spike) I have to choose between using abilities to farm or kill people and take objectives (I can't always get in range for aa since Vel can get caught and is too squishy to survive) this is my main acc: So what advice you have? I should farm more and less skirmish/poke?
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