"Sugar is sugar"...well, not exactly. There are mono-saccharides such as glucose, fructose, galactose, etc. which are the simplest of carbohydrates... and then there are di-saccharides such as sucrose (table sugar), maltose and lactose. A disaccharide is composed of two monosaccharides; sucrose is made up of a molecule of glucose and a molecule of fructose. Other more complex carbohydrates are polymers (repeating units) of the simpler carbohydrates. Different microbes actually prefer different kinds of carbohydrates, and a specific species of bacteria may prefer a specific kind of sugar. It's all about the enzymes that any given microbe has available for metabolism. With that in mind it seems like it would be better to have a variety of carbohydrates (not just mono or disaccharides) in order to cater to the as many of the innumerable species of microbes (bacteria, archaea and fungi) living in compost, earthworm castings, humus or whatever you're using as an inoculant, as possible.
Corn syrup should actually contain a variety of carbohydrates including the more complex carbs ( as long as it isn't high fructose corn syrup). Blackstrap molasses has a good variety of carbohydrates and also contains vitamins, minerals and other substances microbes will require to proliferate.
I'd be apprehensive about using outdoor soil in a tea. Even if you know that no dangerous chemicals of any kind have been applied to that soil, you probably don't know the biology of it and it could very well contain some nasty microbes or root-eating nematodes. If you've got castings, compost or humus why use soil from the ground? Compost and castings should have many times the beneficial microbes and nutrients or regular soil.
To the OP directly, you can still quite possibly fry your seedlings with tea if you make it with strong amendments such as guano and blood meal. If you want to make an AACT at this point, I'd recommend keeping it as simply as possible. For a half gallon of water: a quarter to half cup of the earthworm castings, a teaspoon or so of blackstrap molasses and maybe the fish emulsion will do.