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I mean, as I will give a vote with max power each time, it automatically increases of curation reward if I am calculating right. Suppose I have 50% of moting mana. But I can vote like having 100% of my voting mana. Isn't it automatically an increase in caration reward?
Correct me if I am wrong.

I think there's some valid points in your thinking. But at the same time a 100% vote will always take away 2% voting power instead of taking 1% if your voting power was at 50%.
So you vote will have more value, but if you vote from 80% to 50% voting power, your curation rewards will be the same