I know this is an old one but there are a lot of good basic points to be made from this HH. I'm only going to do the top subject in my mind for now.
1). OP arrives at the correct assumption (that a 5! will scream KK+, and villains will mostly fold), but the wrong adjustment (to flat the 4bet).
The proper adjustment** is to have a wider 5betting range. Literally just throw some of the combos of suited wheel Ax and you will be fine. You have a nut situation to cold 5bet here to the point of which Id actually be more excited to see A
4
here than AA. When everyone yawn folds and calls you a nit show the 4 ldo.
**Now, I've said all of that, but this is even more important, and completely counter to my first point. You actually don't have to make adjustments. You can take face up lines and literally announce to the table you have AA, LITERALLY, and it will still be more profitable to 5b. So even if you are a scared money nit that VPIPs once a session (me), you still gotta take face up lines for fat value here.
You have the best hand in poker and are 1 trillion bb's deep. Absolute worst case scenario you collect ~$200 uncontested. That's a sweet worst case scenario.
When you flat you 1) don't bloat a pot with the best hand in poker 2) don't go heads up in position vs. a whale 3) allow potentially 2 other villains in with position on you in a smaller pot. Remember people make less mistakes in position and realize their hand's equity more in position. People also play more straightforward in multiway pots. All of which is bad for us.