I installed new shower diverter. Other than the hot and cold being reversed water came out fine. Took cartridge out to reverse the water. Turned water back on and water barely comes out. Thinking it was the cartridge went and bought new one. Same issue. I oiled new one according to instructions, same issue. Water
Pressures are good, don't know what I did wrong.

Remove handle or knob. Handle or knob only, not cartridge. Turn stem 180 degrees, reinstall knob or handle.

[I oiled new one according to instructions, same issue. Water
Pressures are good,
Now I'm confused, In one sentence you say you have the same issue,(Low pressure) and in the next you say the pressure's good. Do you have good pressure or not? Do you still need assistance? Back to you, Tom