Advice/thoughts on potting Media?

[Npsen]

I'm running out of potting mix, the mix i use right now contains sponge rock, Charcoal, and fir bark and seems to be okay.

I will be repotting one of my phals soon and I was thinking of changing my mix to:

Redwood vs Fir? Is redwood any better?
New Zealand Pine (Orchiata)
Lava rock
Sponge rock
and Charcoal ?

What do you guys think?

Also my phal is planted in this REALLY thin plastic pot...I was thinking of using a terracotta pot (has slots on the side) of the same size

What about clear mesh pots?

What are your comments/ thoughts on these? Or any advice ?