I ran across this thread and wanted to say well done, great information here, nothing definitive yet but for anyone that likes to experiment, like I do, this is a great avenue to play around with.
So I have thrown my hat/plants into the ring and started some testing with IBA and will post as I have information you all might find interesting.
First test was to dissolve 10mg of 0.6 IBA in water and feed it to my one of my Kush mothers in soil. This strain of Kush is very potent, very tasty but is very, very difficult to clone (4 weeks to start seeing roots, 6+ weeks before planting in dirt), so I was hoping to up the rooting capabilities of one of my mothers with an IBA dose. So far not so good, I have posted the initial picture before watering and a picture 11 hours later, lots of drooping going on. So I have flushed her with some water hoping to lessen the effects of the IBA, apparently my dose was too large. We'll see how she does to recover and if she recovers sufficiently, we'll see how her clones do at rooting. (Pictures posted backwards, this mornings is first and last nights is second.)
The other picture included here are some clones I am trying to root in a misting cloner I built. I have an ultrasonic fog generator that is humidifying the clones, there are also some clones in there that I recently extracted from rockwool, those are 4-5 weeks old and have some roots already. All of these clones have been generously dipped in IBA rooting gel to see what will happen. I should mention that I am using Technaflora Root Tech, the only ingredient listed on the jar is IBA 0.6%.
I'm basically trying anything and everything I can to find a better way to root this hard to root strain.
I've have very limited success rooting in rockwool, low relative humidity makes keeping the humidity up and the temperature down very difficult so I am trying other avenues, bubble cloner, misting cloner, jiffy pellets and my hormone experiments.
Much respect to everyone in this thread that came before me and inspired these experiments.
TKG