There's another BTE facebook page,
https://www.facebook.com/groups/BacktoEdenGardening/ , that I've been checking in on throughout the summer. Lots of people posting their results on there too. I've seen quite a few that had major struggles and you can get advice from other members of the group on what to do. I've seen some like you have that were highly successful too.
Just my observation, but it seems that the more broken down the chips become the better it gets. My reservation right now on starting a BTE garden lies there. I think if I do, I will pile the chips up and let them compost for awhile before I begin to use them. I think I will also use mulch hay underneath to try to get a good balance of greens and browns going.
I use hardwood bark mulch from the sawmill to mulch my front landscaping. It breaks down very quickly as compared to wood chips that are mostly cord wood. After the first year there was a good, black dirt layer underneath with only the larger chunks remaining. After the second year, it was all completely decomposed and added a nice thick layer of humus to my awful clay soil. I will need to add more next spring. I have still had trouble with weeds the whole time, but I think that may have a lot to do with my lawn (and my neighbor's) containing so many weeds instead of good turf grass. This was a farm originally, not a suburb. I've got pasture grasses reseeding by the millions. It is still hard to keep after them (if you don't get to them while they're just little things).
The plants in that bed have grown and thrived so well, far beyond what they did before I transplanted them from an un-mulched area. The decomposing mulch allows their roots a more friable soil to move through, as compared to trying to spread through rock-hard red clay. I totally see how this BTE method will work, but I think it may hinge on time allowing the mulch to break down some first. That, and I hear you have to put it on really thick to beat the weeds. How many inches deep did yours end up being, Bee?
I've enjoyed following this thread on your experiment and I expect we will really see some great things happening in your garden next year!