ah their earth rate is different to mine, 19 deg rather than 13 deg. I copied Paco for that figure - I'll check it.
.... not multiplied by 1.5...
earth rate is 19.5 deg, amended total drift is 19.5 + 8.7 = 28.2
and whether you apply it to the great circle or rhumb line tracks the average is 076. Agreed.
I really shouldn't attempt these calculations!