Add Micro? You mean micro organisms?
Mycorrhiza is great for growth. You're roots will start growing overtime, and as your roots grow bigger, your folliage will start growing faster. And you'll end up with bigger buds.
Don't use the stuff from the grow stores though. Just a bunch of advertising mumbo jumbo to try to sell some overpriced junk.
Go to your nursery and ask them which one they use. I'm using MYKEs tree & shrub transplanter & I can recommend that one from experience. And it's only $13 a qt & $25 for 3 qts.
You'll need to add less nutes and you'll have bigger plants. But get ready to start transplanting them. I didn't treat till the 3rd week, I'm in the 8th week, and I'm transplanting into 10gal containers. If you start from day one, you'll need 15gal to 20gal containers by the time you flower.