AQ is overplayed by casual players probably more so than AK, because people tend to treat them as similar in strength, when they're not. In most situations you don't want to be getting a ton of chips in the pot early with AQ. If I'm 3bet then I take villain's tendencies into account, like their 3bet% -- this is where a tracker/HUD are highly useful (assuming enough hands). Unless we're really deep, in position, and villain is a real LAG, I'm folding to most 3bets.
KJ is a dangerous hand in early-mid position; unless the game is short-stacked or very short-handed then I'm usually folding. Suited cards only give you about 2-3% more equity so don't go thinking it's a lot better suited. When you're called it's very often dominated or an underdog to Ax. If you pair on the flop it's really hard to know if you're best or not but really easy to get way too many chips in the pot before you realize you're beat.
Bet sizing is a separate issue, and generally speaking your bet sizing should not vary based on your hand strength -- this is highly exploitable by good players. I routinely vary my bet sizing based on blind levels and stack sizes, sometimes position (with EP raising a bit more, especially in cash games), but not hand strength -- in most cases I open AA the same way I open 98s. I only switch up based on hand strength when it's an intentional ploy to induce or take advantage of certain players based on my reads of them.