Your spacing is already a little tight. If you want bigger ears space the plants out further. Double row sounds thicker. That will just give you smaller ears. I space mine about 30 inches by 10-12 inches and get big ears if I apply enough water and nitrogen.

I'm not familiar with your variety but some have much bigger ears than others. Also some have deeper kernels and that makes a lot of difference. Kandy Korn has shallow kernels. Mirai 301 has big ears and deep kernels. It also holds 10 days in frige.

A short answer, yes. My parents always do, but I don't know their spacing. Last year I did corn for the first time (finally enough room!), and did double rows. But my setup is different from yours. I have 3 ft wide rows alternating with 3 ft wide paths. So my plants were 12" on all sides within the double rows and then 5 ft of "emptiness" to the next double row over. Lots of room for big tall plants that use a lot of nutrients.

I agree with Fruitnut in that your spacing is already a bit snug. Just moving the rows to 2 1/2' spacing will help--that's what I use. And maybe its time to use other varieties since you've given it the college try. I've had good results with Delectable, another bicolor SE type with similar maturity time as Peaches&Cream. (I'm personally not a fan of Mirai corn; I've grown it and it's too sweet for my taste--I don't like my corn to taste like a lollipop.)

In my experience it has been the spacing between plants in the row that makes the most difference..13-14 inches.

Thanks folks! I've long suspected that my spacing was an issue. Easy nuff to correct......