Hiya.
How's the FIM going?
Re the cloning. You can clone pretty much any time you want. If you do it in veg - it is a little easier, and then you will be in the same situation you are now of FIM and LST to control height for the next 6-8 weeks. If you feel up to it - you will end up with big plants for sure.
OR
"Budding" or "Flowering" Clones. Wait til about day 21 of 12/12 and take clones from the bottom branches of the plant. Those you would likely be trimming off anyways about that time. The flowering clones will take a little longer to root, and then take an extra 10 days to revert to veg, but when they do they will be far bushier than a normal clone AND the timing should work out that they are ready to go into the 12/12 area as soon as your current ones come out.
BTW - you seemed to jump right into FIM - which is great - but you should definitely explore LST.