I dont use that exact model but if u open versaworks go to media explorer see if you even have 2xcmyk profiles . u may have to go through update settings and select d/l all profiles instead of just your printer and ink type.
yeah to do away with white and met. ink you must clear old ink channel install new ink lines , heads, dampers, caps etc. everything the ink touches must be replaced. then you will have to reinitailize printer to 2xcmyk then refill all channels. if you did it right it would cost atleast 2500 maybe 3k. i would not do that personally cost doesnt equal the output speed difference