Rockwool - Coelogyne cristata

[MCSchrum]

I purchased this species last summer, and it has grown very quickly. It has more than doubled in size, and the more than half of the plant is hanging over the edge of the 4 inch pot that it came in. It is still growing in the original sphagnum moss. I've read that Coelogynes can sulk after being repotted, so in order to minimize the frequency of repotting, I'd like to pot it in an inorganic medium that will hold sufficient moisture, namely rockwool. Does anyone have experience growing Coelogynes or similar orchids in this medium?