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You are right, with exception of number 2. She wanted to destroy SeeD, true, but the reason to initiate TC was much bigger than just that. She was using TC to absorb the power of all sorceresses in history, and later, absorb time and space itself.
Back to topic, I think Kefka is the most evil.
On topic of most evil, it's probably Zermus or Ex-Death or the pre-FFVI villains.
People like Zermus are simple haracters and often the simplest characters are the most evil or good according to typical definitions.
Kefka, Kuja and even Ultimecia all have some level of depth to their actions; motivations and circumstances that made them, or at least lead them, to do what they are doing.
So you could argue Kefka isn't truly evil because he's insane. Evil is the conception of the sane mind.
Kuja had humanistic motives and an evil way to carry them out...he's in a grey area at the end.
Same for Ulty.
Duh! Dr Evil all the way.