I agree with John. Get used to the quirks of 3D printing before trying finer prints. I use 0.2mm for small stuff (6mm scale) and it definitely prints better than the 0.4mm nozzle with the same layer height of 0.08.
I always let the slicer do the resizing and that is one of the big benefits of a 3D printer, is that you can rescale stuff really easily. eg I brought a 28mm farm set from Printable Scenery and I have printed it in 28, 15 and 6mm, but the quality of the design does effect how well it will resize.
My site http://6mm.wargaming.info/