I will start off saying that I have never read the works of Xavier or any potting mix experts. That said there may be some truth in it and it may be worth reading and throwing on the balancing scale of advice. This is not for me to say, as I have my own opinions which have been shaped by my doings and those of people around me.
The simple answer is, experiment. No one has the same conditions and a potting mix that does well in some conditions may be a bad idea in others. I have seen orchids grown well in so many different things I can honestly say there is no "perfect mix". I can say one thing about them though, and that is that each mix, no matter how off the wall, allowed the factors for healthy root growth inside those growing conditions. These factors are simply moisture, air, and minimal "pollutants". The ratio of these things will determine if you have healthy growing roots or mush.
Slipper roots as a whole need air. If your roots are constantly wet and get no air you will get an incredible case of rot, though there are some phrags that break this rule. If your roots get minimal moisture and lots of air, they will dehydrate on the other extreme, again with a couple exceptions. Your conditons outside the pot will further influence your conditions inside the pot, so they must be considered as well.
So what is a good mix? A good mix is one that allows both moisture and air around the roots without one element overwhelming the other. Think of the feeling a paper towel has after it has been soaked and completely rung out. It is neither wet nor dry, as it has an airy damp feel to it. To me, this feeling is what slipper roots want to be surrounded by. In your conditions, this will take some fine tuning of components to determine what gives you this feel and how long it will last. Obviously after watering, the mix is soaked, but over the time period between that initial soaking and the time it takes to dry out you get this condition. It is also important that the whole pot have these conditions, as it is common to have perfect conditions in the middle two inches but be too dry on top and too wet on the bottom leading to a plant with dehydrated roots that don't penetrate the mix on top and rotted roots at the bottom of the pot. Many growers will counteract this by using styrofoam peanuts on the bottom and moss/rockwool on top making a potting mix sandwich of sorts to keep conditions even throughout the pot.
Onto your initial question, with the above considered, I think you do indeed have some great components to make a great mix out of. I will have to guess your growing conditions and base my advice on what I would use if growing in your shoes. First off, I have seen so many people who's culture I bow down to use CHC for many years that I will not dare bash it as a component. I do bash bark down a little out of resentment from my early years, but again some of the best growers out there who we think may have a magical spring they water from use bark. My personal mix is fastly becoming half expanded clay(hydroton, aliflor, prime agra, etc) and half small rockwool cubes. I would however not recommend this mix if your humidity is not consistently over 75% as it dries out very quickly even in high humidity. A guess at a good mix for you would be 2 parts CHC, 3 parts aliflor, and 1 part rockwool cubes. Once you have a ratio you want to try, test it! Fill a pot with it, sit it with your plants, water it, and see how it responds over the next week. If it dries too quickly, add more rockwool cubes and/or CHC to the mix. If it stays too wet add more aliflor or don't use the rockwool cubes. Experiment, experiment, experiment! No one in this hobby has all the answers, and if they say they do they are spending too much time spouting other's experiments as gospel rather than doing their own.
I hope that somewhat answered your questions, even if in more of a "catch a man to fish..." kind of way.
Jon
