It's easier to put each question into one thread. However ...
1. You are correct. "While" would suggest that when the percentage changes, we can reconsider the decision.
2. Yes, you may drop the "that." You can usually drop "that" from most sentences; it's often there for emphasis, to clarify meaning, to make it easier to read without having to go back and look at the sentence. It often has no specific effect on the meaning.
3. Yes, but "even though" is more emphatic.
4. "Had lived" suggests he has to yet live there more time, to continue to live there. Simply "lived" there means that he hasn't earned the right to speak, yet, and possibly never will, because there is nothing in that sentence that suggests he is still iving there. He may have lived there a few years ago. Not long enough to have an opinoin.
5. "I'll see to it" means I'll take it upon myself to ensure/see that it is done.

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