In addition to reducing the beam divergence, you may wish to use a smaller beam size by using a smaller collimator or making the slits smaller. A smaller crystal can also help to spatially separate the Bragg spots as can moving the detector closer to the crystal. Yes, closer to the crystal. This is not intuitive, but arises since modern homelab beams are not parallel but are diverging from a focal point near the sample position. It is just something else you may wish to try.
How you flashcool your sample will also have a large effect on the spot sizes/shapes. Jim >..... >Another thing: most in-house sources allow you to reduce divergence of the >beam. You lose intensity, >but no matter, just expose longer. That also >improves overlap. > >Cheers >phx