From my petrol-chemical back ground you will be in great shape. Really a larger line will take more time to build pressure but you retain more volume once your pressure is reached. This means that when your hydro gos out your air stations will run a bit longer.

Only con, that comes to mind is to make sure the air is good and dry going into the lines. I would expect you could get a build up of condensation in a larger line.

Cheers Don

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7/8th of an acre, Perch only pond, Ontario, Canada.