I'd say the clue is the material itself and the geometry of the object. But in terms of Slic3r settings you could experiment with:

(print settings >> support material)

• pattern spacing (he has here something around 5mm)


• pattern (I'd say the best for you is rectlinear)


• contact z distance (choose 0.2 or close to that)


• interface layers (here 0 (zero) for sure)


• don't support bridges (this one depends on your geometry and if slic3r calculates something as a bridge or not)

All above is also connected (in a way) with HE temperature and layer height. Usualy the higher temperature (in a range for specific material) the better sticking between layers.