Piston orifice and evaporation temperature for refrigerant

I checked my superheat at different ambient outdoor temperatures and found it was correct.
At 75F condenser dry-bulb the vapor pressure is 70 and line temp is 59. For my refrigerant (422b), the dew point is 47.5F at 70psi.
Although the superheat is correct, wouldn't it be better to have correct superheat at a lower vapor pressure to say 59psi and 40F dew point ?
Since it is close, I would think a small step down in orifice diameter would accomplish this.

Generally speaking, what is the target temperature for refrigerant evap when sizing a piston? (obviously higher than water freezing temp)

Thanks,

Jim

source https://hvac-talk.com/vbb/threads/2239348-Piston-orifice-and-evaporation-temperature-for-refrigerant?goto=newpost