Touring Tyre Pressure

I have got a tour in Japan in 6 weeks’ time, all 99% sealed roads, but I still haven’t decided on what tyre pressure would be best. The tyres I will be using are Schwalbe Marathon Supreme HS 469, HD Speed Guard (Non-Tubless version) 700x35c. Below I have listed my weights.

Bike: 15kg (33lbs)
Rider: 75kg (165lbs)
Luggage (loaded on rear rack only): 15kg (33lbs)
TOTAL: 105kg (231lbs)

Normally I would just run max pressure (85psi) for least rolling resistance, but I have read a few articles that say max pressure may not always be the fastest (rough roads). In the cycling about article it recommends not exceeding 75psi front and 80spi rear. Giving me a range on my tyre of 60-80psi. What Tyre Pressure Should You Use for Bicycle Touring? - CyclingAbout

Would 80 psi be the fastest? given 99% of my route will be sealed roads.
Would I risk any pinch flats at 60psi?