Phal with rotting roots - Help!

[rose07]

Hello,

This is my first Phal. I've had it for about a month or so, it had 6-8 blooms that have all died and fallen within the last week (all at once), which is what made me look at the roots. It was potted with moss and I noticed it was taking too long to dry from the last time I watered it. I water every 7-10 days or so - checking on wetness/dryness. Potted on clear plastic container, with enough holes. Thinking about repotting it with bark instead?
I took a look at it today and found that some of the roots where rotting. Proceeded to clean out all the moss and cut some of the roots that were dead. Rinsed it to get medium off. As you can see the main base of the plant is black. Should I cut it off too? There are some roots higher up that might make it if I cut the base. Is it better to do the cinnamon thing? or both?

You can also see there's a new spike growing on the bottom. It was growing faster a couple weeks ago, but doesn't look like it's dying.

Thanks for the advice.

p.s. took the pics right after rinsing it...that's why it looks wet.