Bro, to rte/rtm on Ghosts, stay on CEX
look if you install ccapienstone.pkg or if you have forcehost EBOOT.BIN of 1.06 Ghosts.
u dont need switch to DEX, you can brick your ps3 if you do it wrong and its difficult to manage
Recommend you stay on CEX, im on CEX now and i host XP normally.. sometimes i have to refresh clients list but its only one click