'own_window_type' is the biggie! Use 'normal', not 'override'.
Here's what I use, in that section...
Code:
####
## Create 'own_window' type. Makes Conky behave like other panels.
#
own_window yes
own_window_transparent yes
own_window_type normal
own_window_hints undecorated,below,sticky,skip_taskbar,skip_pager
####
## Some distros require the following lines for true transparency.
## BOTH of these lines need to be Commented/Uncommented in tandem.
#
own_window_argb_visual yes
own_window_argb_value 255
GNOME 3 Staging || Liquorix 3.7.0-10 Kernel || nVidia 304.84 || Plank || ACYL || ConkyWX 0.7.9
Works in GS & Unity...