hey there EvilSanta, 1.3 is totally fine, you can raise it though. a rule of thumb is if it's not broken dont fix it, on the other hand if you want to see how far you can push a plant (maybe for next time) start low, then increase the nutrients by a few points every week or so until you spot the very first signs of nutrients that is slight discoloration on the tip of the leafs and revert back to the previous amount of nutrients before you noticed it. that's the max for that plant. Hope this helps ! ๐