For early morning flights like your 7AM and 5AM flights, no need to go to airport for more than 1 hour. Just be there within an hour and you'll be fine. There won't be many people in security lines.

For your 7PM and 8PM flights, I'd just 1.5 hour prior and you should be fine.

I find that around 9AM to 11AM, 2PM-4PM, 7PM-9PM to be the rush hours for most of the airports in terms of TSA security lines. The only reason they are long is because sometimes, they only have one or two lines open, which to me still mind-boggles me as to why they can't open up more lines when they are there.