I would go deeper.Is 6" not enough depth?
I have read that it is recommended to cut off early flowers (or at least after they bloom) because of incidents where the fruit becomes too heavy and brings down and snaps the young plant's stem. Once the plant has grown more, letting flowers go on to fruiting won't make it too top-heavy.
How long does it take for the fruit to fully develop? Will it be done before the snow flies?