Hmm... your doing everything right imo....I can't answer that plant then if it's aero, as for I have no idea with that!..I don't worry about ph, I kiss, great soil, good buffer.....only thing I can say is try and keep your temps below 80 at all times, I know can be rough but even those few degrees can stunt, hurt the plant...but bugs, I can answer too all methods can get bugs, soil obviously gets them easier...but I'm sure certain mites are hard to get rid of but some of them are easy once you actually identify what it is (not saying you have any) but if you can get a 30x or 60x jewelers loupe...you'll want it when your close to harvest anyway...but look on undersides of your leaves that seem affected, stems...if there is black specs, yes it could be soil BUT could be bug shit to!