thats ideal ph,comfrey bro,i swear by it,has just about every thing the plant needs and can be a stand alone feed,if you mix the stinging nettle in with it,steroids hahaha,you have to ferment them seperate though,once fermented you can put them together,honestly though i dont think putting in the soil will help you,the roots are alread balled up in the bucket,only feeders would expand and that might hurt ya come yield,it take couple weeks to get over the stress,probally wrong just my opinion,ive grown them in 5 gal homer buckets and just about same height,only issue i had was what you have already done,putting the foil around the buckets,that sun fry there ass,if its as hot as it been here maybe light watering 3 times a day to keep um cool