ZCI Reinforced O-type Pinion Gear

I've have no luck with the ones that I've bought in the past. I've tried them on SHS, XYT, JG, and CA bevels but they just do not mesh well with any bevel other than ZCI bevels. They're extremely tough, but unfortunately I just can't get them meshed right with any bevels to a good enough state to use. Switching to SHS, or other stock pinions yields far less gear grind after shimming.