from your description mine does the same.

Hesitation is not too much of a problem compared to my old 2.7.

However, after a small hesitation it suddenly leaps forward with dramatic acceleration, it almost seems to be "all of nothing".

I have had mine a year and still have not settled into this "issue". I suspect its just the way its designed. I believe the twin turbo set up is a low speed turbo and a high speed turbo. Therefore the sudden pick up is the low speed turbo kicking in, which of course the 2.7 never had.

Martin 2016 RRS 4.4 TDV8 Autobiography Dynamic in Montalcino Red and Stealth Kit

Martin - have you had the updates applied
When my car was serviced back in November, there were two updates to the gearbox which stopped the symptoms you are describing happening  ON THE WAY: BMW F21 M140i
MERCEDES GL350 - Metallic Navy Blue w/Grey interior

GOING: BMW F31 335D MSport+ xDrive Touring
GONE: Land Rover Discovery 4 HSE - Stornaway Grey w/Black Interior (wish we'd kept it )
GONE: BMW F10 520D MSport - Carbon Black
GONE:MY12 RRS SDV6 HSE Sumatra/Ivory/Grand Black Privacy glass