There is fixed nose ballast and variable nose ballast.
NOSE BALLAST [E][E-2] T.O. 1F-5E-594 J and [E-1][E-3]
In addition to the fixed nose ballast, additional variable nose ballast must be installed when inboard pylon fuel tanks are carried.
A1-8 weight 15,170 (W/BALLAST) includes the fixed nose ballast, so 15,170 is the gross weight. Variable nose ballast must be added to that when inboard pylon fuel tanks are carried...
We already know pylons are currently weightless, so it seems likely the additional variable nose ballast is also absent.