My terrain is large - what is the world machine export process?

I have worked out the following -

XY is 15km * 15km (or 1,500 000 cm)
Height - 2625m (or 262 500 cm)

XY Scale = 1,500 000 / 2017 = 743.6787307992955
Z Scale = 262500 / 65535 * 128 = 512.7031357289998

I take it that means Beside “Landscape Scale” I ought to have :

x = 743.6787307992955
y = 743.6787307992955
z = 512.7031357289998

That sound about right?

EDIT : Just saw your post above - 4033 is low?

Regarding resolutions, 4033 is the highest that the engine allows according to the documentation I read lastnight.
The world composition guide says to use a tile resolution of 2017 - Am I basing this calculation off of the main resolution or the tiled resolution?