Milk and Cream Cookies for Santa!

This has been an interesting grow. This week I did some massive defoliation -- even took off some lower branches that seemed to just be producing larfy buds. I'm not sure how this is going to recovery but it will be a good expirement either way. This plant should have 3-5 weeks left in its growth cycle, from my estimates. I'm thinking I'll try and push the nutrient level a little bit higher this time....I've seen some other growers getting high PPMs with autoflowers while I've been trying to maintain less than 600ppm. While that seems to have produced nice buds, I am wondering if perhaps I need to give just a little bit higher levels in the primary flowering stages. I'd be interested if anyone has any ideas or thoughts about this. What's your "max" PPM for autos?