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I run my single vortech at ~80% (I always say 70 because it is 3 lights from the end, but I think there are 12 lights) and my corals seem to like it. I'm always toying with the idea of adding a second to get more flow and get more mixed flow in the tank. It can't hurt if you just feel like spending money, but honestly in a tank that size, it's not necessary to add a second pump.
It will not likely increase alkalinity and calcium consumption. Growth does that, and having one vortech at a relatively high flow rate should be plenty of nutrient transport and respiration that you won't improve those by increasing flow. I don't think, but I'm not a coral doctor.
Keys to growth:
Stability
Appropriate parameters (including slightly increased alkalinity and calcium, though it's debatable)
Plenty of light
Plenty of flow
Lack of pests
Plenty of food (whether it be fish poop, direct feeding, elevated nitrate/phosphate levels, etc.)
I think with those you'll be maximizing growth opportunity.
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