Maintenance for the week of March 2:
• [COMPLETE] ESO Store and Account System for maintenance – March 3, 9:00AM EST (14:00 UTC) - 12:00PM EST (17:00 UTC)
Do you still have it slotted? I know it's a stupid question but that's the only thing I can think of. I haven't experienced it not getting anymore experience, and I've also morphed it successfully.
I'm not in game right now but on the world skills (soul) that will only open up further if you continue through story I believe...I could be wrong but hopefully someone will be along shortly to clarify.