SPOILER ALERT!
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Let's see...
1st problem: To get the helm of serenity, you have to first complete the marten's bluff section, in order to get a certain item there (I'll spoil more at the end of this post if you don't know which item this is). Take that item back to trynton; it will help you speak to the shaman who will give you a key; the key is for a certain door at the beginning of the 6th bough (the rattkin tree). search the floor in this room.
2nd problem: seems you've doubled-up on quests. Rodan and the T'rang that you've rescued from the away camp will not want to leave your party until you've brought them where they've told you to. Do that first, then go back to Bayjin for the other sgt.
Hope this helps. Good luck!
(other SPOILER coming...)
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get the IDOL in Marten's Bluff; then solve the little mystery that awaits you once you get it