I use a lot of poser content and find some of the morphs are easier to apply in poser, then import into carrara afterwards. That's the reason I leave P7 on my computer.
P4 is always the worst option, PP is better. P5 and up are the better options.
Still, the carrara shaders need to be tweeked and sometimes the poser bump map does not get registered in the carrara settings. Sometimes that is because the poser bump was procedural.
When this happens to characters, you can set a carrara procedural bump (see DAZ tutorials for info). Or, just use a bump map from another character.