I feel your pain, it was awfully difficult to find a solid company that would make a holster for an M9 with a light on it. Especially because i have the Thicc Boi Brigadier slide on mine.
If I'm going out in the morning or midday, i CC an M92FS with Langdon upgrades (but no light) in a JM Custom Kydex holster. It's extremely comfortable, and my favorite gun to CC.
If I'm going out and expect to be out near or after sundown, I CC a Wilson Combat M92 Brigadier Tactical with an X300V on it in a Red Hill Tactical holster. It's the only company I could find that makes a holster to fit the Brigadier model M9 with a surefire light attached. I'm satisfied with RHT, but it isn't as solid a lockup as the JM, though this may be due to the flashlight on it.
Check out Red Hill Tactical, but I think T.Rex Arms might have a model that works, or Tier 1 Concealed may as well.