id say what people call instinctive is also partly aiming, at least for most. i shoot instinctive but cant hit squat if i cant see the tip of my arrow, but if in not focusing on my target, i start flinging arrows everywhere but the target.
I went to The marshalls primitive rendevous, in michigan and when i was there, they were having a bear across the pond shoot. I didnt have my own bow but i was using someone else's for the time being. All i can say is that when i shot, i was actually not doing too much aiming. how could i aim with a bow with no sight, that i had maybe 30 min of practice with. So instead I sent one arrow down, marking where my tip was (above or below the horizon, nothing specific) and adjusted for that untill the third and fifth shot... they both just felt... very right when i drew and shot. i didnt see the arrow hit but for some reason i knew it would (it did, and i did win... goodness knows how). now every once and a while, everything feels perfect like that, no matter if its close or far.
basically what im saying is its just practice. Practice until you get it right, and be happy when you do, then practice until you never get it wrong, and be proud of what you've learned.
also remember to look at what your shooting in a 2d perspective. there may be 25yrds between you and your target but in the end it only takes about 2" of vertical movement to move that arrow from 10yrds to 25yrds (and when your even closer it takes less and less to change where that arrows going). so if your hitting the ground below your target, just know your actually closer than you think.