I can't say necessarily that the fairrieanum does well, but its holding up so far.
My troubled paph experiments in S/H include:
SS seedling, now in coarse bark mix, doing well
Ho Chi Minh, crown rot, stopped with Phyton and still in S/H
sanderianum seedling, now dead
wardii alba, recovering in bark/sphag mix
emersonii seedling, recovering in bark mix
randsii seedling, recovering in bark/sphag mix
venustum seedling, recovering in sphag mix
I'd say at least 2/3 or more of my paphs are doing decent in S/H though.
Not sure exactly what it is. I could flush more often, but I water frequently with plain rain water, nothing added. I should test the pH of the reservoirs, maybe the LECA has some impact on that?