Don't know about your printing setup but I just tried a print here with print sharpening set to standard, printing about 10x8 on enhanced matte on Epson R2400 and it looks about spot on. Sharp but with no halo.
All I did to the shot was a little capture sharpening and no more. If you do sharpening beyond this I could see that the print sharpening could take it over the top.
This was a RAW file opened in LR2 with default sharpening so if anything it was probably a bit soft prior to printing. I did uncheck the Print Resolution box which I think means the 9180 will print at maximum resolution.