Flimsy stems and whispy leaf’s

Try giving your plant some silica . It will help strengthen the stems.

Looks beautiful and healthy to me. Are you watering too much? I stick my fingers in soil to first knuckle to ensure I feel nothing wet to ensure it's ok to water.

I found this with a strain recently, increasing the light intensity helped during veg but when it came to harvest they were still a little weak. Try adding some silica to your nutrient schedule, this should help increase strength in the stems...Good luck