Ducati XDIAVEL Owner's Manual page 71

If the track/path features bends all taken at similar
speeds, it will be easier to find a level suitable for all
bends; while a track/path with bends all requiring
different speeds will require a DTC level setting that
is the best compromise for all bends.
Level depends on riding style
The DTC will tend to kick in more with a "smooth"
riding style, where the motorcycle is leaned over
further, rather than with a "rough" style, where the
motorcycle is straightened up as quickly as possible
when exiting a turn.
Tips for use on dry road
Activate the DTC, select level 6 and ride the
motorcycle in your usual style; if the level of DTC
sensitivity seems excessive, try levels 5, 4, etc., until
you find the one that suits you best.
If changes occur in the grip conditions and/or circuit
characteristics and/or your riding style, and the level
setting is no longer suitable, switch to the next level
up or down and proceed to determine the best
setting (e.g. if with level 5 the DTC intervention
seems excessive, switch to level 4; alternatively, if on
level 5 you cannot perceive any DTC intervention,
switch to level 6).
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Tips for use on wet road
Level 7 is recommended when road is slightly wet or
damp and level 8 on wet road. It is also recommended
to select ENGINE LOW in these conditions.