Which technique should I use for this grow please???

Reading from your diary, these plants are definitely being over watered. at this early stage the plants really don't need too much water at all. Water once the top inch of soil is dry as a rule of thumb. Since your grow tent seems pretty full, SOG would work pretty well. But if you have the time and patience to LST every single plant and make sure that they are properly adjusted every week, go ahead, it just may cause too much clutter in your canopy when the plants start getting bigger.