Here's a rear cam GoPro Session. I can see I'm not getting my upper over enough.
Hey Matrix22, thanks for the video upload. A couple of majors things that I would address first before I would have you work on anything else.
Priority 1 - Never look behind you! The video clearly shows you looking to your left and right over your shoulder as you are approaching a lot of apexes on the track. This takes your focus off of where it is supposed to be which is in front of you. If you are running the proper line on the track, it is always up to the passing rider to adjust their line to get by you. Even though you are on an R3, the line is still yours if you are leading the pack.
Priority 2 - When do we sit in the middle of the seat? Never! Be sure to always have your butt off to the side of the upcoming corner well before the brake zone. Example, NCBike, the last turn is a right turn, then turn 1 is a right. Your lower body should be set on the right side of the bike all the way down the front straight. We cover this in the Novice riders meeting at lunch time. The reason we do this is because we want to minimize the number of things that we are doing, and minimize the input to the chassis upon corner entry. Think efficiency of movement.
So next time out you are going to fix those two things first, right? Ok good! ;-) On to your upper body. In order to get to good upper body, we need to have the lower body set. This is our foundation. It starts with proper foot placement because we need to be able to support our weight when we move to the inside of the bike. I would need to follow you for a couple of corners or see some video of you being followed to be able to see your foot placement better but based on just the 2 pics you posted earlier, it looks like you need to rotate your foot a bit more so that you can focus that weight transfer onto the ball of your foot. (Think of a ballerina when they stand on their toes.) Your inside foot looks a little flat which doesn't allow you to put much weight on it. This means when you go to hang off the bike, you end up using too much upper body to "hold on" to the bike and end up getting twisted up. You look like you are back off the tank enough and your butt placement is good so I wouldn't change how much you are getting your butt off.
Grab a CR next time you are out and work on this in the pits or come to one of the lunch meetings and we will review BP. And great job on working through these things. It's always tough to make adjustments like this. You can see how much the pics and video can help though.
And oh yeah, NONE of us are Lorenzo, and we are ALL working on these same skills ;-)