I overfueled my flight for like 4 hrs excess that i dont need. Do i just go faster?
I would suggest dumping fuel, as long as you are above MLW with your weight you can dump a lot very quickly as long as you stay above MLW you should be good!
For fuel, I calculate the average flight time from my airport to my destination airport, then I
Add 30 minutes to 2 hours extra fuel (depending on the tailwind)