Hi jefkve, I was taking a look at your swing and noticed that you are crossing the line at the top.
Check out this simple drill from Michael Breed which will help explain the issue with your swing, and how to help reduce the issue.
Personally, to nail this I'd recommend using a mirror - and just making some swings at home (simply back swings) so that you can ingrain the feel into your back swing that you'll find when the club shaft is properly on plane. Here are a few other tips to monitor when you are doing the Michael Breed drill.
1.) Right elbow placement - try and keep your left and right elbow spacing tight in the backswing.
2.) Maintain pressure in the Right armpit - try and maintain that pressure in your right armpit - so that you aren't letting that right arm/elbow go behind you.
3.) Left wrist hinge - make sure that you are hinging the club up during the backswing properly.... Look at Foley's backswing - how vertical the shaft is at A3 (left arm parallel to the ground).
Ultimately, getting the club on plane at the top of the back swing is going to make it much easier to make the proper down swing move into impact. You should see your ball striking improve dramatically just by getting the shaft of the club on plane.