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There are many diseases that could be the issue. This article will help you pinpoint the cause.

https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-plant-problems.htm

Your tomatoes have gone from dark to lighter green. Next comes red! Heat over 90 F. often halts ripening of the tomatoes as the plant is stressed by the heat - even if kept watered. When (if) it cools off a bit, ripening will proceed. If serious heat is on-going, think about using "shade cloth" to lessen the sun's intensity. Here is more info on heat and tomatoes for you: https://bonnieplants.com/library/how-to-grow-tomatoes-in-hot-weather/

I don't think you have a choice. Tomatoes need moisture so if you don't water them, you will reduce productivity or lose the plant. Yes, uneven moisture is a risk factor for cracking but what are the options? With a drip system you are less likely to end up with soggy soil as sometimes happens with several days of heavy rain. You can always set it at a reduced drip rate or break the watering into twice daily so that moisture uptake by the plant is slow and steady.

They are edible, but this can easily be cured. This is a calcium, and magnesium deficiency. Dolomitic lime will provide both, and prevent the issue.

They can curl due to many reasons, including genetic. Most of the time, leaf curling is is completely normal, however, it can indicate that the pH is off. You should aim for a pH of about 6.5 to 6.9 in the soil. This will ensure that the only leaf curl is a natural leaf curl.

If you are noticing any other symptoms other than curling leaves, then it can be a sign of leaf curl virus, but in most cases this is just a defense mechanism of the tomato plant.

This article will give you more information: https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-leaves-curling.htm