400w Grow S.A.G.E and Berry Bomb **Looks Amazing** ( I need Help )

I have 1 SAGE and 1 Berry Bomb mature beauties under a 400 watt hps cool tube in a 4x4 room. This is my 3rd Grow but i must say it is by far the best Ive ever done. I was always scared to hurt my girls i never realized how strong they truly are. I did a few experiments this time around just few to name; Clonex from seed, Topping and FIMing, Suppercroping, and T5s. Ive been reading up on my information, watching videos, searching for anything i can do to better this grow. My girls are about 18in tall and the canopy is about 3ft by 2ft and have been flowing for about a week now. Laid a ScRog net they looks amazing. Yes... By far my best grow. but as i said i need help

Problems Im having:
- I have each plant in a 10gal container with about 6 gallons of water. How should i be doing my water changes, its going to be much more difficult with the trellis net. Usually i would just take one place it in an empty container take the full container and dump it in the tub, fill it back up and place it back into the garden. This method is a Bitch i need a different way of doing this.

- Experimenting with topping and FIMing. Topping is the way to go dont even bother with FIming, is not worth it. I topped the Berry Bomb 1x and i FIMed the Sage 1x. The berry bomb looks great a really strong, sturdy plant. The Sage looks beautiful, but where i FIMed, 1 of the side branches Cracked doesn't look too good. i took a zip tie for support and put it back the way it was. Should i be concerned?

Thanks In advance for any Help

Pictures of the FIM i was talking about and pictures of my 2 plant garden.

The zip tie should hold the plant together just fine. As for draining your medium you may need different containers with drainage holes and plugs on the bottom. Or maybe a hose and a pump would work with what you got.

Thanks for the advice Bud Tipps i was just worried because i put her into flower i wasnt sure if i should have veged her for another week or so.
As for my containers i might stop at home depot. Maybe i can make something for drainage out of pvc but if all else fails yea i guess ill have to buy different containers.

do you happen to have any advice on cloning?