what a lovely selection of strains you have there! Franco´s Lemon Cheese is pure fire!
Do you use Nutrients or is a water only growth? What is your medium mix?
Is not ready, i wouldnt start flushing so early.. start flushing when your plant looks ready.. your plants look very healthy.. those are sativa dominant plans
the purpose of the rubber string was to keep the flowers as tight as possible because it keeps getting tighter and tighter as time passes . When you finish to wrap it properly, your fingers/hands hurt, hehehe
Also, when you wrap the dried buds and add the cognac, you exclude the possibility of...
put the flowers in a plastic bag, push all together with the hand then get that tyre tube from bike, cut it and make a strip.
use that rubber strip to wrap the flowers as tight as you can, then finish with the tape to hold the rubber together compressing that
of course i recall it, special...