So, its a little later than i expected, but i have an update for you.
Heads still do not stack properly when getting heads from blazes.
sometimes it helps get some of the heads in one stack if you place them and then pick them up again
~ @Mitque
This however did get them to stack. Thank you Mitque for sharing how to get them to stack. It is a little clunky, but does the job. Is there any way that our developers/coders/admins can do some creative editing to get this fixed?