To help get back on track ... Op.
Some growers routinely grow with compost either Ecoscrapped or chicken , etc.
Good source of nitrogen and PK , some growers Worry about biosludge , parasitic issues , handling hazards ( respiratory - no bueno to breathe in ) and other things.
Dolomite lime , oyster shell can be amended to your mix to BUFFER a bit too.
Your strain looks good , purple pheno expression , mutations are what they are .
As far a SIMPLE Nutes ... I would say look into POWDERED lines. They are far more shelf stable than most liquids that require you to SHAKE BEFORE USE ( reconstitute ) many liquid brands WILL CLUMP at bottom .... Dynagro ( good stuff / bad shelf life ) ... had to do warm water baths to bottle just to break it down. Mega crop is the DARLING of 1 nute offerings. Used from start to finish.
GH also has good 2 / 3 part lines .... I currently run MAXIGROW / MAXIBLOOM .
Powdered 2 pound bags .... simple / easy .
If your soil is amended properly it will carry growth for weeks on just water .... just sayin.
If possible ( cut out the unknowns ) by picking a good bagged / amended soil.
Sunshine mix #4 , Roots Organic , ProMix , Dr. Earth , Fox Farms Ocean ( a little hot but loaded ) , Happy Frog , Black Gold .... this way you are starting with a more balanced BASE medium and ONLY feed as necessary.
You can bump it with more perlite ( aeration / drainage / helps reduce compacting too ) .
Neem meal to be a Preventative Pest / disease ( I put a 1/4 to 1/2 cup to container soil j if I had plants on a deck / patio . Also good bagged soil can be used to make teas ... cheesecloth bag in water.
Later on you can COOK your own soil ( many recipes online ) ...