I have been trying to complete the aforementioned trophy Super Sonic, but it will not complete no matter what I do.  I have flown through horizontal 1x1 gaps and vertical 1x1 gaps with the elytra multiple times each, and the trophy will not complete.  I am at a loss as to what to do, so I think it must be a bug.  Attached is an image of my setup to try and get the trophy, 3 images showing the setup I was using for a vertical jump and one for the horizontal one.  Please help.