My tomato plants seem to being growing better with the leaves than fruits

You want to get some fertilizer that is higher in phosphorus (P) and potassium (K). A good organic source of phosphorus is bone meal and wood ashes or granite dust are good sources of potassium. You can look for an organic fertilizer at your garden center that has low N and higher P & K values.

Adding compost to the soil when planting your tomatoes will help. You can also make some compost tea and water the plants with it or spray the leaves for foliar feeding.

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Good Luck and Happy Gardening from Cathy and Neal!