building a better bato

I need some suggestions.

I have 11 liter bato buckets, I ran them with 2 to 3 inches of clay pebbles in the bottom and the rest filled with coco.

I decided to give running 6x6x6 rockwool cubes a try, i am going to stick them in the bato buckets. I will probably keep the 2 to 3 inches of clay pebbles on the bottom because it helps keep the other medium from clogging the drain.

So i need to fill out the rest of the bucket. I am considering coco, vermiculite, perlite, potting soil, more clay pebbles or some combo of any of the above.

The 6x6x6 cubes will fill out a good bit of the bucket, but there will be space around it and below it that needs another type of growth medium.

Also, am i suppose to remove the wrapper on these, or cut slashes in them or just leave them be?

No experience with this.

But just my small teeny tiny bit of exp in rockwool (im a hydro guy) the rock wool really holds that water so i would mix a good wicking mix mabey mostly coco with a bit of perlite.

So you dont drown roots

As to whether or not you cut the wrapper off.
I would leave it on till your plant gets established

Then when you got a nice ball of roota in the cube then you can cut the wrapperif you plan on planting to the top of the cube.

Hope this helps as i have 0 exp with batos

Or has anyone used FoxFarm Ocean Forest Potting Soil? Might that be an option?