Needs a sanity check on Vertical Transformation

Hello,
I have been trying to perform vertical transformation with Proj for a few
days now, I think I am done but I am in some help to be sure I didn't make
some stupid mistakes!
I am looking at getting coordinates in WGS84-Ellipsoid to WG84-EGM96,WG84-
EGM2008 and to NAD83(2011)GEOID12B.

Here is what I have working so far : 
WGS84-EGM2008 : cs2cs EPSG:4979 EPSG:4326+3855
WGS84-EGM96    : cs2cs EPSG:4979 EPSG:4326+5773
Is this correct?

So naturally I thought that GEOID12B would be as easy : 
NAD83(2011)-GEOID12B    : cs2cs EPSG:4979 EPSG:6319+5703 <= no vertical
change
NAD83(2011)-GEOID12B    : cs2cs EPSG:4979 EPSG:5498         <= no vertical
change

After reading about geoidgrids I tried this and it works but I need to be
sure I am using the right parameters
cs2cs EPSG:4979 "+proj=longlat +datum=NAD83 +geoidgrids=g2012bu0.gtx"

Thank you for your time!




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