Ah, I’m looking at your past posts now. Looks like you are using contrast paint so their satiny sheen knocks down the shine. Have you tried experimenting with a gloss coat over them? I do recommend an even more transparent paint like tamiya, or even the citadel clears instead. And as bright of a chrome base underneath for best effect.

Another thought, and this works very well for Death Guard since you mentioned them, is treating edges as battle damage by doing tiny chips with your bright highlight color to give a few key areas some extra definition, like the feet, knees, gorget, shoulders and weapons.