I have two very happy camps - in almost opposite media.
My female is growing like mad in LFS mixed with schultz orchid mix.
My male is growing in....I'm not sure what, but it's dense like concrete. I got it in trade from Dave Evans - I think he said pete & lime? Whatever it is, it's hard as a rock, but the plant is growing fine.
Both are spiking, and have done so in the past, too.....so they must be happy.