You can control the spread of mites by paying attention to the direction of handling, EG start with your most valuable plants first, while you're 100% clean (like your flowering ladies), then move onto your vegging cuts, then move onto your vegetables, then your flower garden.
After that, everything you're wearing should either be washed, or what I like to do, especially since I'm always wearing a hat, is to put everything in the freezer for 24hrs.
Also, pay attention to your shoes/feet. Either a change of shoes (I prefer Crocs, easy on/easy off, plus they're TOTALLY washable) or those shoe condoms the Directv technicians wear.
The spotting all over the leaf. They present the same way inside as out. I treat the same way inside as out, isopropyl alcohol usually, sometimes JMS if I feel like mixing it up.
Ca and P, in my opinion. Strong on both. Given that, while I'm not the best person to discuss how to balance nutrients, I would give nutrient balance a good hard think. That along with pH ranges, because pH being out of range will lock out what they're being given.