Bugologist- truly enjoying following your threads! But a question about your mainlining approach- you state that some strains respond better than others to this technique. Can you say a bit about what happens with a plant that does not respond well? What growth pattern results then?
Heres a few traits that result in a better main-lined plant in my experience, strong sturdy stems that don't need much added support, good node spacing (not too bushy so that light cant get through, and not too lanky where the colas flop all over), and single cola dominance as opposed to branches shooting out everywhere.
Its not that some plants don't respond well, its that some plants need extra care/maintenance I.E. pruning large leaves, extra support for branches and reinforcing weak points.
Some plants just take to it naturally like my LD50 #9 and Purp Bagseed.
Indica dominant hybrids work great to main-line with, not to say that sativas don't, you will just need to add a screen or some bamboo for support.
I think every type of plant can benefit from main-lining but you have to know that strain and be able to make tweaks and adjustments in order to succeed in your environment/scene.