Looks good! 2 things to note though...
Psychic barrier will effect them, it'll give them a 1+ save and while a 1 is still always a fail if they get hit by a
AP-1 attack they're save will still be a 2+. if they're in cover as well and they get hit by a
AP-2 attack they'll again still have their 2+ (+1 for psychic barrier, +1 for cover).
Also units can move normally after disembarking! So less than 20" valkyrie move, 3" disembark (staying 9" away though for grav insertion), 6" normal move, then 3" charge