muck... yep, thats the slimy stuff I was talking about. no bueno. But, you have found a way to work around it, and it is working for you, so a pat on the back for that.
Have you seen how I do this? My first observation here is that now instead of a 5 gallon smart pot, you have turned it into a 4 gallon... so already the roots have been limited compared to what they could have been. The airflow is pretty good through that fabric without any extra help, and drainage is actually too good, as evidenced by how slowly you need to water a fabric container. The problem is being able to keep the bottom dry, and by doing so keep the roots from trying to grow out of the bottom. You solved this your way... I solved it by putting the rocks on the outside, under the smart pot. My river rocks keep the container out of the run off in the drip pan, and airflow is allowed all around the container because it is lifted off of the drip tray by the rocks. I also get 5 gallons of soil in my containers, and no slime. (except in the drip tray
) Anyway, just trying to show you how I think you could fine tune what you are already doing... you got the right ideas, I just think there might be a bit more efficient implementation available to you. Not criticising at all... actually I am quite impressed with that screen... I think I did something similar once.