Hi,
I’ve A K8400 with heated bead.
There is no problem to print PLA/HIPS (185°c).
But i’ve serious adherence problem with ABS.
Bed temp 0 to 85°c tested with no result.
Extruder temp 200°c
Extrusion multiplier 0,9
Witdh on the first layer 200%
Skirt 6mm
Brim 5mm
Wath’s the good parameters to print ABS?
The best result is obtained when coating the bed with a 3D adhesive like Dimafix or 3D Lac.
Heat the bed to 90-100°. No brim needed (or only if the surface in contact with the bed is very small ).
Extruder temperature about 220°-225°.
I’ve closing with tape maximum of the vertex opened areas.
As there is a working abiant temp 30~35°c (vs 15~20°c before) and that solve 100% of the problem. 
(Bed temp 80° extruder 225°c)