I picked up a Fuji Semi Pro 2 sprayer over the summer, and I've been struggling to get a smooth semi-gloss finish with SW Emerald Urethane and the standard 1.3mm tip. Despite trying a variety of spray patterns and air levels, I am consistently getting a rough-feeling finish. The semi-gloss look is there, but it feels like 600 grit sandpaper to the touch.

I am adding about 25% water to get the viscosity right, and I'm using the 1.3mm tip that comes with the sprayer. I don't know if it makes a difference, but I have a bottom feed cup rather than gravity fed.

Any ideas what I might be messing up?