Hey Ase! Hope you thoroughly enjoyed your vacation!
After reading through this post, we definitely do things a little differently! I'll try and list as many things as I can remember lol.
1. I think we top at different nodes. I believe you stated that you leave the 3rd and 4th nodes on. I leave the 2nd and 3rd nodes on. Looking back at a pic someone posted on here about which ones to cut, it almost looks like the first node is completely in line with the cotyledons. Is that normal with photoperiods? I have only ever grown autos, and there's normally a noticeable vertical space between the coytledons and the first node. Anyway, we both seem to be getting great results, so maybe it doesn't matter so much. For my next grow, I might try 2 of the same strain and keep the 2nd and 3rd on one, and the 3rd and 4th on the other.
2. You take branches off, like the undernode that you referred to. I barely take anything off, mainly because I'm just afraid I'll hurt my yield. Once I'm in full on flower, I always regret not taking lower stuff off, so this is something I would like to start trying. As for the undernode, instead of taking it off, I just gently bend and twist the top part of the branch where the undernode resides, and I'll stake it down when I'm happy with how it looks. Instead of having an undernode, I come out having 2 side branches. When my girls get ready for training, I will post some pics here to show you what I'm talking about if its difficult to visualize what I'm talking about (I tend to ramble sometimes lol).
3. This one isn't really about training, but I think it's important to state this difference. You grow photos, and I grow autos. I only bring this up to show other people who are reading this that it can be done with autos too! And it works very well if I might add lol.
Like you, I also do defoliation to allow light to lower parts of the plant more light, and to keep airflow going. I haven't had mold issues yet, and I would like to keep it that way!
Thank you for welcoming me to this forum. Going back to our previous discussions, it is true that I hadn't been on this site at all and just decided to leave an extra node on one of my plants to see what would happen. Again, I find it awesome that you have started this technique and have been showing this community in detail the steps you do for the quadline technique.
The other forum I'm on is definitely starting to take notice of my (well, yours. You tried it first lol) technique. On one thread we are having an auto showdown, just a bunch of us growing autos and showing each other different techniques. One guy is fluxing his auto and it's looking really good. I'll stick with the quadline though. It's given me great results so far.
Here's a pic of my first plant that I quadlined. It was Alien v Triangle by mephisto.
Have a great day Ase!