Its tough to say without seeing the roughness your mentioning. It could be a couple of things. Can you get a good pic of the "roughness" and post?
Using a higher mesh should help to smooth out the print yet will offset the amount of ink being printed thus issues with print opacity will come into play. You might need more print*flash*prints to get the correct coverage.
I believe you can also heat press the print for a second to help smooth it all out yet this just adds one more step to the process and takes form your profits.
Hard to say without a good visual. Might be your too picky
which can be both good and bad.