Sounds to me at contact with the ball you are not in the same position you were at address. This for many reasons is why you are having problems. A fast cure is stepping up a club or two, that's right two. Say an 8 iron is your 150 yard club , go up to a seven or a six. Swing easy knowing you have plenty of club.... After a few hits you'll fell at ease and then you'll see a dramatic difference in accuracy and distance. 

When you are out of sync the arms, right elbow is flying around and you are having problems putting a good contact position into execution. Look at Rory's swing (here on the website) the have slow motion and you can evaluate how he keeps things simple in his swing, 3 components make up a huge factor for him. 

Study, practice but make it simple. It is an athletic move and keep it that way. Meaning not to incorporate someone else's swing to yours. Some components work and others don't. The moral of the story is to have the least amount of component moves so when impact comes you are more consistent. 

See you on the range! 

more than likely you take the club back inside on the way back, cross the line at the top, get steep on the way down, then have to lay off and have to flip and maneuver the club in the last bit before impact on the way down to compensate - when you throw in the visual of weird angles and lies, there are too many angles for you to work out in your sub conscious so it goes wherever. work on getting the club to the top on plane. hands inside, club head outside on the way back for halfway, then just turn turn turn.

return the right elbow to your side and move your lower body toward the target simultaneously to initiate the downswing.

once you are square at the top, aiming your feet shoulders and hips is a lot easier, and then you can make adjustments with set up to compensate for weird angles and looks.