Well it doesnt say to put the cocoa in the keg it just says to add after Primary, that could mean that you're supposed to do a Secondary, which is very common when adding adjuncts like cocoa powder. The lactose can really be added at anytime. How long has it been carbing. You might do a keg to keg transfer to another keg to try to leave the trub behind.
Primaries: Mojave Red (AG)
Kegs: Hibiscus Saison (AG), Orange Kolsch (AG) , Cocunut Porter
Future Brew: Wee Heavy