I didn't comment on the 1440 vs 2880 issue, because while it might make the leading and trailing micro-banding less obvious, I don't think it will solve it. I've often read that anything more than 1440 is pointless on matte whereas 2880 may be useful on gloss. However I think that applies to the OEM driver. It's less clear that it applies to QTR. Because I use piezography K7 inks I always print at 2880, because that's what those curves are designed for. At 1440 I think you'll find those K7 QTR curves too light. I'm not sure about the shipped K3 curves, because I almost never use them, but perhaps they have been designed for 1440 on matte and 2880 on gloss.