I kinda doubt that Curumo fell under Melkor's sway while he still had any power; the Valar probably would not have sent him as a representative of the West if so. Curumo was just arrogant, and wanted to be the bigshot in the group. Gandalf annoyed him because he took the spotlight off of him now and then (The story of Olorin being chosen in UT, Gandalf being given the Elven-ring). Curumo just let his own hubris nail him to the wall, that's all.
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