HulkberryAuto Window + 20Watt CFL

Plant grew quite a bit and now has 3 nodes. I added some extra soil for support as the stem was still quite thin and the plant was wobbly. Moreover, I am now using a 20watt CFL light (Philips Tornado) and with this it grew better than before. I put it in daylight about 5-7 hours a day, although it barely gets direct sunlight due to the cloudy dutch weather. I am wondering if I should cut the top already, but I think I will wait a week. Then, I will start the LST to keep the plant low to the ground. If this is ofcourse very wrong, please notify me that that is not the right way of doing .... Thanks :)