You just s**k and maybe you should take another year off.
Only kidding my brother!
I have only been here just over 3 months. I did hear that a while ago it only took 2 hits to kill a plane. Now it takes 4 hits (sometimes I like to put a 5th on too) to kill a plane. That may be one thing that you are not aware of.
Obviously you want the enemy plane in your aim. In which direction to lead the aim is a different story. It sounds as if you just need to get back into the groove. Play some more and eventually you will get it back. I am not sure about expecting the 7 to 1 kdr though. That may have been easier to achieve back then but now only a certain few can accomplish that. I don't come close to that against quality players.
If you play at a kdr of 1:1 I say you had a good game. A game up to a 2:1 kdr you had a very good game. Anything higher well then you had a great game.
Keep this in mine too. I think we all go through the ups and downs. I will have a day where I can't hit anything. Another day where I just can't miss. Go with it and have fun.
Hope you get your aim back just not when you are aiming at me.