This is another area where many screen printers fall short. You may assume that what you get from the separator is correct, but that means you're relying on the separator to make decisions for you. You may think that's why you are paying the experts, but this is a dangerous and chancy assumption. Before you image any positive to a screen, it is essential to test the data on your film positives to make sure they're suitable. Dot shape is delivered as ordered.
Angles are as specified.
You can verify these with a Polychrome or Beta screen-angle determiner. Halftone line count is as ordered. You can purchase a 10x loupe with a calibrated reticle to measure in 0.1-in. Multiply the measured value by 10 to determine your lpi. Final image is the correct size according to customer specs.