Potting Mix and Re-Blooming

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Question about Phal orchids. Most of my orchids are rescues from Lowe's. At first I would immediately re-pot them in a bark mix (Better Gro Special Orchid Mix) with mixed results. After reading the forums, I started leaving the plants in the original spag moss to allow them to acclimatize to their new environment first.

What I have found is the plants in the original spag moss seem to re-bloom nicely while my plants in bark are not re-blooming.

I water/feed the plants in bark about every 7 to 10 days and the spag moss when it dries out (could be several weeks).

I wanted to see what others have experienced with re-blooming and the type of potting mix. Also could it have to do with the watering cycle. This Winter I had two plants to develop root rot in the bark mix which made me think I was either over watering or over potting. I am working with reducing the pot sizes but afraid I may be under watering?

Any thoughts?
Bob