Looks nice JB and thanks for sharing your results.
I hope your warping with ABS is now more less with this update.
With my UM2 I haven't used ABS till now, only PLA and Carbon_Fil.
With PLA I start the fans around layer 15 (with a 0,1mm layer height) so the first layers are not getting the full fan speed.
The fans starting slowly around 15% until the max speed.
(result is, I'm getting less warping effect)
In Cura my settings for the the fans are:
I'm not sure if these settings will do the same with ABS.