Also known as megablooms, and here's a link with lots of info,many threads from here at Tomatville.
https://www.google.com/?gws_rd=ssl#q=megablooms+tomato
And the best book on megablooms by Marv Meissner,a retired cardiologist whom I know very well.He used to come here to Tville,but interest was limited so he stayed mainly at those sites which featured large vegetables.
https://www.google.com/?gws_rd=ssl#q...+size+tomatoes
Carolyn