I have a strange strategy for not missing a 3 point shot.
Try this out and see if you see what I mean. Take Reggie Miller from the 90's all stars and practice in all-star mode. If you are fairly good, you can hit like 2 or 3 three pointers in a row and then miss.
Now, instead of timing it so that you release the button at the top of your jump, release the shot at the last possible moment before coming down again (release just before you get a traveling violation) and you'll make an almost unlimited amount of three pointers.
I haven't had time to try this in a full game or other players, but at least I bet you get a much higher accuracy if you release at the last possible second.
-Alex