What should be done about those buds that haven't grown high enough? They are there right under or above the net.
Leave them to grow or remove them completely?
You're canopy is so completely filled in, so i would remove anything under it. I think it's best to remove those as early in flowering as possible. Being only 3 weeks into flowering I'd pluck every single one of those little energy snatchers.
Great looking plants, I would remover anything under the net but don't chuck it as there are plenty of good trichomes to be had. Keep the offcuts of your trimmings to make cannabutter, hash oil or tinctures.
If it looks like it's producing a good size cola might as well keep it. If it's gonna be just some larf strip it off imo. Cheers and happy growing! Looking great!