After the cycle I will do 20-30% water changes daily for a week to ensure that the bacteria grow in the power filter.
The reason you do water changes after a cycle is to get your nitrate levels down. After you're done cycling, that's all you're left with... nitrates. There's no reason to do them for a week. When you stop doing them is determined by what nitrate levels you don't mind having in the tank. If it was me, and since nothing is in the QT to start with, after the cycle was over I'd do one big 80% water change or so and be done with it.
By the time your tank has cycled, the bacteria IS in the power filter - assuming you have a bare QT.
Other than that, what you wrote is what I'd personally do. Maybe others might have additional opinions.
On a side note... are we still talking the 75 gallon? Six chromis in a 75g seems like you're using a lot of your available bioload just on one type of fish. You won't be able to add many more fish after that. That's cool if you like chromis, but just wanted to point that out in case you haven't thought through your entire stocking list yet.