You're "real" sources only quoted cotton, and they put that at 60% of the total trade. The South produced Tobacco, Sugar, Hemp, and Molasses as well, and that accounted for another 13% of the total trade.
And i'm being nice here. According to Pea Ridge, (If I am remembering correctly) the official records of the US government puts the South's trade value at nearly 82% of the total.
But even according to your "real" sources, you have admitted to the South producing 60%, so you are only arguing over 13% of the total.
Why is it so important to you to fight to keep that 13%, as if that makes it okay for the South to be paying 60% of all the taxes with 1/4th the population of the North?
Instead of quoting the America hater Dickins, you’d do better looking at a contemporary Englishman, John Stuart Mill.
“...what are the Southern chiefs fighting about? Their apologists in England say that it is about tariffs, and similar trumpery.” Yet, Mill noted, the Southerners themselves “say nothing of the kind. They tell the world … that the object of the fight was slavery. … Slavery alone was thought of, alone talked of … the South separated on slavery, and proclaimed slavery as the one cause of separation.”