Last year I played with this idea a bit, planting some very deep while others I only planted to the depth that they were in their starter pots. Both sets of plants did very well, but the deeper planted ones absolutely grew into much stockier plants. They held the weight of the fruit much better. As far as 'more' production or timing of fruit set goes, however, I could not tell any real difference. The stockier plants certainly held up a bit better late in the season.
