Beautiful plant. Its looking very happy.
You have the green thumb...the
special green thumb.
Dont worry about growing in Miracle Grow soil. It is fine.
I have grown for a long time and I used to buy the more expensive soils like sunshine mix. I have used Miracle Grow soil exclusively for the last 3 years now due to being able to buy it easier in normal stores like walmart. The chemical amendments that come in the soil are used up in around 30 days. I use an organic nutrient tea until the last 2 or 3 weeks when I flush well and only give plain water until its harvested. The buds taste great with no chemical taste and they burn to a nice white ash.
So lots of plain water at the end and that AK will taste great.