You have a great strain on your hands, I'd do a good 60 day veg since height shouldn't be an issue with the training and topping so you can get a good bounty of cuts before you flip. Cloning after the flip is MUCH harder because of the hormonal change from growth to flower really stops root growth. Maybe even keep the best and do a re veg so you always have a mother for clones with no genetic drift since it's from seed. Also never flip a seedling before 40-45 days because they aren't fully developed. And be carful staking, especially during flower. Avoid disturbing and damaging the roots as that's the number one reason for herms other than of course an incorrect photoperiod or light leak. If I have to stake in the pot I try to gently roll them into the very edge of the pots but prefer to tape them to the outside of the pot if I can. I also use yo yo's or string to hold up the floppy buds if the branches won't support the weight. If you build a healthy plant with good structure and thick stems you should be fine. Silica is the best way of achieving this besides your nutes and a decent time in veg. Silica also creates almost a waxy layer on the stems that pest tend to avoid. Before you flip lollipop and get all of your clones and get rid of the inside foliage leaving fox tails to bud and you won't have any larfy and loose buds, just big top buds. I defoliate again in the 3rd week of flower removing about 20% of the leaves that are in the center or blocking a lot of light penetration. Basically grow a giant bush and then leave the top two feet to produce the biggest best buds possible because you're only going to get about 24" of really sufficient light penetration needed for top shelf meds. You are off to a great start bro. Best, Irie.