Im sorry, I should have clarified a little more.
If you are using miracle grow you do not need to add any fertilizers including fixes, because nutrient (salt) buildup will occur and your plants will be experiencing transplant shock as well as over fertilization.
The body of my post was an example of what I went through with my plants, using my transplanting from dirt to hydro. However, if using a commercial potted soil, you do not have to add the nutes. I personally dont know how to fix deficiencies this early on other than start with better soil. I am using the 3 month grow formula right now with a nirvana white widow plant just to get in started, then once it has about 6 nodes I am going to transplant it to a 6" net-pot (5gal-bucket-topper)
My recommendation is that you ride it out, because these plants are really quite fond of abuse. Let your plant recover and grow a few more nodes, then transplant to miracle gro mixed with much more perlite (it looks like) added. I dont have any recommendation as per soil, but I do highly recommend researching the hydro system, set it up right/completely, then transplant there once your plant is bigger and stronger. But I am biased. I cannot seem to start plants in rockwool, so I use miracle gro to start my plants then induct them into my world of abuse (if I havent done so already) by gently separating roots from what dirt I can, then highly recommend a dip in the revive/water solution, then lay roots on the hydroton/coco/etc and carefully pack medium around roots.
But thats my experience, and why I recommend such.
I also highly recommend reviewing at least 5 different grow threads dealing with same subject matter before making any impulse moves/purchases. This way, you dont get bad information, or like my post above, somewhat incomplete. Its best to get a wide scope if simply going by individual anecdotal evidence. Not all growers, grows, and plants are the same. Just like political polls; it is not a credible poll if you poll 200 people to represent the views of 408million Americans.