FWIW, I was ready to scrap my cabinet when I saw this and tried the mods. The metering valve being the best mod, I now just have a cup or two of media in the bottom of the cabinet. There are other videos of similar mods and I suggest watching them for ideas.
tacoma company is hit and miss at the best of times and the owner is a dick, its easy to source everything out online with better made stuff for less money. i tell everybody that those cheap cabinets are awesome as soon as you throw away everything but the cabinet and start over. it is a huge improvement though. its like you are using a different cabinet