Looks great.
I use a combo of that or close to it with Ecoearth mixed in or Ecoearth and cypress sometimes I use all 3 with some moss.
I don't change out substrate too often. I spot clean and most of the snake waste is fairly benign if you miss a spot or two it dries and degrades into the substrate.
It is actually good to have a certain amount of bacteria in the cage. It is healthy for the snake and the ecosystem within the cage.
A pure, and completely sterilized environment doesn't let your animal develop or build up any natural immunities.
NOTE there is a fine line between some healthy, natural cage bacteria and a dripping wet, mold ridden cage.
I typically do total substrate changes twice a year. Most of my animals either don't eat in the winter at all or slow down a great deal.
Hopefully nobody is spending too much $$ changing this stuff out too frequently.
The cages look really nice man.