Hey Bud......clones.....my environment sucks ass....no joke.....I maintain it as best I can....
With that said.....my first clone off a plant is usually the top.....I just did 2 tops about a week ago or so....1 Kush Mintz and 1 O.G. Kush Limited Edition.....they are still barely hanging on.....the mothers went in flower....bout 5 days in flower, I took 2 more clones of each plant.....they have already rooted.......
WTF......all I can say is this.....I have little control over the environment.....some clones take in my area, and then there are some that don't like it.....
Once you get it down, it's easy.....the getting there is trial and error....
Make sure the medium is always moist, not soaked.....if the clone is standing, don't spray it.....if it's drooping, spray it......
I'm sure this wasn't any help, but it's more of a don't stop trying type of thing.....