What equipment are you using for these if I may ask?
Leica R8 with DMR, Leica-R lenses (a 40-year-old 560mm f/6.8 and a 20-year-old 280mm f/4 APO with or without extenders), shoulder stock, 62-year-old eyes & hands.
No front- or back-focus issues, no left-side errors, no micro adjustment needed, no grabbing the near wingtip instead of the eye, not confused by busy backgrounds, no distinction between cross-type and non-cross-type focus points, no need to 'upgrade' to the latest equipment that is supposed to reduce these problems, and an infinite number of focus points covering the entire picture area all with the same sensitivity and usable at all apertures.