I've had preflowers form just like that on an older mother plant that was always in veg for my SOG set up. I think that is also why your clones look like they have been revegged and are growing so branchy and crazy. Personally I would replace that mother plant with a happy healthy fresh plant.
I ran a perpetual SOG set up for 11 years. I kept mothers in a small veg tray and took clones about every 2-3 weeks(I would keep mother plants for 6-9,months usually before replacing with a healthy clone). The clones were allowed to root, and then were put into 6 inch pots of hydroton in the veg tray. They were given another 1-2 weeks to root strongly into those pots and usually grew to about 8 inches tall. I then put them into flower and trimmed off the bottom 1-2 sets of side nodes to encourage upward growth. Typically I'd end up with plants between 24-30 inches tall with one main cola and a couple smaller side branches. I could comfortably flower 45 in a 4x4 flood tray this way and averaged 20g dried per plant with mixed genetics, and closer to 30g per plant monocropping.