I have a client who is looking to print a custom automotive gauge design on Lexan 10mil fim.  We are using our OCE Arizona 350 GT.  Doing a reverse print on a the film with double pass of Rich black/CMYK which has most of the text/numbers knocked out, followed by a double pass of white.  Using 256 ink and I cannot get the text and lines to look sharp.  The customer brought in another sample that was printed on a 480 GT and it looks great and very sharp.  Anyone have any guidance on customizing a profile to get the black to be sharp so the white ink can show through with fine lines.  Fine Art mode is on as well.  Appreciate an help on this.