Your plants are single-cola and if you take a clone it would have to be from the top, which would not only stress teh plant but also make your main bud site go away... = LOST YIELD.
You should take clones 2 weeks before flowering to avoid this.
Do you have a TALL dome for your tray? Read the cloning part of the 1st link in my sig. Is it a single t5 strip or a fixture? Single strip = 10" away, fixture= 2 feet away. Too much light = wilty clones that don't root well.