Again, I'm going to ask what behavior you expect for this? Where would you have that image move? If what you want is for the entire paragraph to go to the next page, you are using the correct mothod by adding a keep option that will keep sufficient lines together to match the image height. Adding the keep within the top and bottom boundaries of the column (rather than the page) for inline anchored images might be useful if it behaved like a keep option forcing the containing paragraph to the next page, but not so good if it pushed the position of the image up or down relative to its anchor point.
What you are learning is that anchored objects are extremely useful, but that they are problematic when they fall at the bottom of a column. You almost always need to som manual editing to accomodate the odd case.
