I have a work around. It seems like each of these 16 y-scales is a "place holder" in a cluster. If you put your mouse over in the "y-axis" area of the graph, right click for properties and select ADVANCED...RESET SCALE LAYOUT, you will see all of your Y-scales layed out. Now the process will be to take each one of those Y-scales and overlay them exactly ontop of one another.
To move a Y-Scale, right click on one of them, select formatting (don't do anything will your in that pop up window except for clicking "OK")and you will then have a "selected" Y-Scale which you can move with your arrow key or shift-arrow key. Once you have all your scales exactly on top of one another, there will be a huge space between your graph and Y-Scale. Left mouse click over the y-scale, select ADVANCED and make sure AUTO ADJUST SCALES is checked. Now, get your y-scale selected as outlined above. Use your right arrow key to close the gap. Once complete, make sure that you uncheck the AUTO ADJUST SCALES. If there is some other trick...someone please contribute!
