It's been an odd year for toms, because the heat just mucked the timing around for the later varieties!
Sungold are always pretty quick, and need harvesting very quickly or they burst, so watering is very important and you've clearly won that one, but AC aren't always the best for flavour under the same circumstances if there's too much water IMHO!
Can I suggest Shirley next year? They have a fabulous flavour and somehow have bucked the trend better than others here, but also try San Marzano, which have been terrific so far! Our Roma haven't done well at all though...