Hi, I land base the CV airgroups in every scenario 19 I play. I have not had the ghost group problem except when a CV airgroup transfers to another CV as a result of battle damage.
I do leave one SBD group on it's CV because this group has 2 reserve aircraft (18 ready 0 damaged 2 reserve) and this leaves 2 ac behind and I'm not going to risk it.
Other then that the airgroups and CV have not given me a problem.