Problem with growing rate of vegetables. | Container gardening | Commercial Hydroponics farming in India

Hi, I have a container vegetable garden. I am getting a lot of flowers and vegetables on my okra, brinjal, capsicum and bitter & bottle gourd plants.

Though a lot of fruits form on each of these plants only one vegetable on each plant starts to grow real fast, while te rest have stunted growth.

For instance I had 2 bottle gourds on a vine. One grew to maturity, while the other hung around as a tiny fruit. Only when the mature gourd was harvested did the other baby gourd start growing.

There are two things obvious here -

1. I am doing something wrong

2. The bigger vegetable is starving the rest of the plants of nourishment.

How do I make sure the nutrients are equally distributed in each plant...so all the fruits on the plant grow together?

I once tried fertilizing the plants a little extra...the plants died on me.

Please help.