I believe we may already be in communication, but I’ll also respond here so that TMU has a clear reference for future builds.
The QuadMinis were specifically designed to be used above our 8" unit. They generally do not perform as well on other manufacturers’ units unless those units include a scrim sheet. Our QuadCoil design provides a flat surface, which prevents the coils from settling into the base pockets.
Some DIY builders have used the QuadMinis as a transition layer. While I haven’t received direct feedback on those applications, I don’t see any reason why they wouldn’t function well on top of a solid layer. They’re not intended as a base unit, but as a comfort layer they can provide additional deflection.
It’s also worth clarifying that the QuadMini is not a micro-coil. It is a true pocket coil, built with 18G wire and a narrower coil diameter. While it functions as a comfort layer, it offers the same performance benefits as a standard pocket coil. By contrast, what the industry often refers to as “micro-coils” are very thin-wire, 3–4 convolution coils sandwiched between fabric sheets. At Texas Pocket Springs, we don’t manufacture those because we don’t believe they add meaningful value to a mattress build beyond simply increasing coil count.