Looking good. Keep in mind the picture should not will the screen vertically. Looks like you have a little too much height and the linearity is off.
Also the horizontal linearity is off a bit. Have you tried adjusting the hor. lin. control ? Can also be effected by the horizontal output and damper tubes.
Here a thread on my 12K2 I restored a few years ago.
http://www.videokarma.org/showthread.php?t=251132