Thats a pretty big tip for spraying clears, but I have not shot epoxy. You might not thin down as much as recommended or try bumping up the pressure. Is your gun gravity or pressure feed? One way to tune the finish, is using a ford cup to measure viscosity. You can experiment with different viscosity by making simple syrup, timing it with the Ford cup and shooting it. Then match your finish viscosity to what works best. Lot cheaper that having to experiment with some expensive clears. If you do try the syrup, be sure to rinse the living crap out of your gun, a lot of metals don't like sugar.