I raise pot from EP, got reraised PSB from BN (we both have huge stacks > 350 BBs, I cover him, its zoom) and now
I am pretty sure I play vs AA here.
I opted for light 4-bet ( he rr-ed from 0,85 to 2,85) to cca 5,55 and got 5-bet from him to cca 20 and I happily called
with KQJ9ss.

Q1) What's best sizing for our 4-bet here in your opinion?
Q2) What do you do after flopping nut straight OOP here where there is possible FD on the board...?

Thanks