Thanks for the suggestion - however, I had already used an 0.15 layer & 40mm/s (overall max speed, with 60% on outline & solid infill - so, some 24mm/s on those).
The only thing I could try, then, is to scale it up & see if that works. But I think, I'll pass on that, for now. I appreciate the feedback, though - I might try it lateron. :-)