So, did you notice that DE jetbikes get JSJ now according to GW? i.e. they are treated exactly like Eldar Jetbikes for assault moves?
So move to 12", open fire, back up 6". You'll undoubtedly get shot eventually, but at least you should be able to 'skip' over terrain in between you and a horde unit and chip away at it.
Still not great, but it is something.
Where can I find this?