81 is fine.
a better grower than myself (
@Cannasutraorganics ) swears by 85, although i am still waiting to see his citation
one way to make watering easier is a simple length of PVC. slip one end into the container to be watered and pour slowly through the other end. it'll save your back some stress.
and those home depot containers are slightly transparent, which is not good. easiest fix is to buy a blue lowes bucket and just slip it right over the orange bucket.
plants are looking good, let us know when that new growth straightens out. should be a good crop.