Well, there are a few solutions but only one of them is somewhat easy. The first is to not grow at the mercy of the weather, so a greenhouse. That would be a massive improvement in all sorts of ways.
Or, the easier way - look at those roma besides them, nice and zero cracking. Roma are incredibly crack resistant, but also there are a few bigger ones which resist cracking fairly well. You just need to try lots until you find some which do better (hint: you should definitely start with Crnkovic Yugoslavian).
Besides inconsistent watering, direct water on the fruit is also a big culprit, as well as big differences in day/night temperatures.
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