I have just re-read this thread because a QF is at the top of my list for my next car. I have mulled over a lot of cars - AMG GT, BMW M5 Competition, Nissan GT-R, AMG E63s, Evora GT430, etc but when I weigh it all up, the QF seems for my needs to be the best allrounder. Easily the best looking too. Ordering a new MY21 in Montreal Green feels like the natural choice. The car that mostly makes me second guess this choice is an LCI M5C, mainly for the idiotic power and AWD plus the tech too.
Then I see you have mapped your car and got crazy power from it

That must be a real handful to drive but intense fun? It is good to know that if I go for a QF and find it lacking (unlikely I admit) that a simple remap can take care of that.
610Hp / 575flbl is 460kw / 770 Nm. That is truly insane! I would love to hear more about how you find it to drive now.
Cheers