200NL
BB is a solid regular, never seen him get out of line. 3 bet is value oriented profile. Doesn't really try to balance it at all. Just waits for fish to join the table and punishes them basically.
($200 Effective)
Hero SB AcKs $6
BB 3bets to $20
Hero 4 bets to $60
BB calls.

Flop ($120) Qs Jh Th
Hero AcKs checks
BB bets $40
Hero calls

Turn ($200) Qs Jh Th 8s
Check x2

River ($200) Qs Jh Th 8s 2c
Hero all in $100
BB calls

Questions
1) Is my 4 bet too big preflop SB vs bb oop?
2) Should I be betting this flop? I feel like I am checking a lot of AA and KK here, that I 4 bet with, so wanted to protect my checking range here some. Maybe I should bet and check if I have AhKx or AxKh? After I face a 1/3 sizing, should I just be shoving? Feels like it's too face up.

Snowie Advice
has preflop as half pot 4bet as higher EV then pot size 4bet. I think AKo benefits from FE though. Not sure if i'm balanced here with my sizing.

Flop 25% or 50% sizing Snowie has about the same EV, but is almost never checking. Also vs the 1/3 Snowie is just shoving 88% of the time or clicking it back, but is not just calling.

Turn as played, Snowie is checking 100%.

River Snowie is shoving 93%