Oven burner flame is low

Question

Just switched my GE gas oven/stove over from propane to natural gas. I changed the orifices for the stove top and switched the regulator cap from propane to the natural gas position. The stove top burners work great but the oven burner flame is very low. I checked the oven burner where it meets the safety valve and it is set to the natural gas position as it should be. It seems like I'm not getting enough gas pressure to the oven burner but I don't know I'm not an expert! Any help or suggestions would be greatly appreciated. Thanks!
James Smith