Other software genereated .objs can come in at very strange sizes. If you can export the object with scaling to daz studio it will be fine other wise you need to fiddle with the percentage size on the import dialogue in daz studio. its not unusual for things to need to be scaled to 1000% or even higher, thats fine, it just re sizes it to the daz studio universe. It is a bit of trial and error but once you work out the percentage you need to use with the objs your importing youll be fine. Its worth having a play.