I live somewhere in British Columbia Canada. I have been a comercial grower for 18 years. I cut clones on a weekly basis. I always bat a about a 90% success rate. In my opinion keep it simple. I dont use any special nutrients for my mothers. I keep up on my spraying neet for pests. keep my room and gear clean my tray washed in between batches of clones. I dont use razors or cut under wanter or any of that. Just scissors at a 45 and dip in rooting powder stem root # 2. I use jiffy 7 pucks and domes unde 24 flouresent light. 5 -15 days rooting time. I open the dome 10 minutes per day for air. I also make sure my pucks are not too wet but just the right amount of mousture. By this method I have produced 15000 clones every month for the last 5 years. I wouldnt bother with the expensive additives or any of that. Keep it simple