As-salaam-u-alikum all, I have be a silent reader of this forum for quite some time now.
Partner I think I'm in a similar situation as you, as we have summitted all requested documentation, had our interviews and had the polio vaccination done back in early November and now have been waiting patiently for a response from the AHC Islamabad. So far everything has been very quiet, however some people have suggested that maybe because of the cricket World Cup in Australia coming up that staff process partner visas maybe busy processing visiting visas, how true this is I don't know but this is what some people have suggested.
May Allah SWT grant us good news soon ameen.
Regards Mohammad