Medium Fir Bark compared to Medium Orchiata

[Cove Lady]

I recently ordered med. orchiata bark and found that the size of it is considerably smaller than the med. fir bark I have been using. I wonder if anyone else has used it to plant Phal's. I have considered ordering a bag of the large orchiata, their web site says that it is 1/2" to 3/4", that is closer to what I have used in the past. I don't want a mix that gets too dense and holds too much water. I don't know if just adding more perlite and or fired clay beads would keep it open or not. I usually make a mix go bark, s.moss, perlite and charcoal. I am potting in air core pots for the first time this year and would like feedback about your experience.