By OOBE steps, do you mean that you need to select anything there first to continue, or does it just load too long? You suppose not to have any selections there, it should go completely silently.
But if loading too long, I would first compare different models, or with/without driver packages. Maybe you have added too much drivers or wrong drivers inside driver package? There are many variables in this, like Windows version and patch level inside wim and ConfMgr build version, ADK boot image version. Is everything up-to-date?