Coast of Maine advice from people familiar?

I’ve just ordered (3) 1.5cf bags of Coast of Maine Stonington Blend that I’m going to grow Super Lemon MAC and Wedding Cake autos in. A thorn in my side this current grow is that I don’t think I used enough perlite in my FFOF soil and also in my Pro-Mix HP/Coco Loco medium, so different drainage rates are killing me.

I really need to know exactly what size perlite (large or small pellets) and how much to add per 1.5cf bag of Coast of Maine Stonington Blend soil? 20%? 30%? Your thoughts are much appreciated.

My last grow in COM I didn’t add any and had no problems before that I added about 20%

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