I have several hundred VFTs. For decades, I have experimented with all sorts of mixes. You name it and I have probably tried it. But, for my conditions, 100% Canadian sphagnum peat works best for me. Soil media is only one part of the equation. The other parts are how and when you water, tray or through drainage, sunlight and evaporative stress, temperature, size of pot, etc. Lengthy experimentation is the best advice.