My first repot- traditional way failed?

[Bribie]

Hi,

I tried to repot one of the healthiest phals, which I got this spring, the traditional way, meaning using bark chips, perlite, charcoal and sphagnum moss. I was very successful with FWC phals in Australia but some of my new phals were not thriving in FWC after we moved to Canada and I’ve decided to give the regular potting mix a try.

I used pro-mix orchid mix, mixed with a bit of sphagnum and put a thin layer of sphagnum on top of the pot with a bamboo skewer as my watering guide. I was spraying the sphagnum on the top occasionally and I watered twice so far in the last month or so and this is the condition as of today. One thick yellow leaf fell and 3 more leaves yellowing.. The bamboo is still moist in the middle.

All my other phals in FWC are doing okay. Some are not in their perfect conditions and some are in ICU (sphag’n bag) but I haven’t killed any yet.
What did I do wrong?
It is very tempting to go back to the FWC with this girl.
I’m going to depot and check the roots now...