When you say "additives" what do you mean? Are you adding aerated compost teas or extracts? EM? "Bugs in a bottle"?

There are a variety of ways (some better than others) of adding microbial activity and bio-mass to you soil. It's important to know the differences, and what you're looking to accomplish.

For increased nutrient cycling, aerated compost teas are your best bet, though they need to be made correctly (you can't just throw some ingredients in a bucket with an air stone and cross your fingers).