I gotta ask why ur choosing this mix?
Organic potting mix is already usually 25%-33%peat, 25%-33% perlite and 33%-50%compost. So to add more peat and perlite in equal amounts to the mixture of the 3 is just diluting down the compost which is main feed of your soil and might be part of the cause of your lower yields. If u just replaced the organic potting mix with a compost of some kind whether it be steer or mushroom(personal fav) you would save ur self money ($3 a bag vs $20+) and likely have better results for more media your microbes can feast on, peat and perlite doesn’t provide anything but water retention and drainage/aeration.
You were so damn close to building ur own soil I’m scratching my head why buy bagged 
