At what stage of flowering were those clones cut? From the colouring of the leaf it looks they were taken late in flowering? if thats the case then its going to take time to pull them round from flowering, a cutting taken late will usually show pre flowers before it reverts, no problem with that BUT they can also take a bit longer to root. Thats my guess.
Didnt look great when you got them did they! I personally only ever mist clones and keep them standing on slightly moist perlite, covered with clingfilm to hold that humidity up. Humidity is the key to rooting clones faster in my experience, that and taking the cuts early in flowering when the stems are very soft and pliable. Don't mean to lecture you, you say you have cloned many times and some strains do put up a fight!
Most of my cuts have preflowers during rooting, dont worry about that though.
I hope you can pull them round, let us know?