I try add like 4 litres of perlite per 5 gal pot but I don't fill pots all way up about 4 gallon of mix, stuff I use is canna terra professional, expensive only good stuff I found in my country
Soiless peat based with extra perlite, megacrop 1 part with added MKP for flower and cheapo lights, sf1000, ts600 and 150 watt mars about 350 watts of light.