Yes, with your flow rater (constant pressure expansion valve or CPEV) metered system, you will not get the reduction in capacity as with a cap tube. For low-ambient operation, what you would want to do is put a high-pressure sensor in on the fan circuit so the fan doesn't start until the condenser reaches a certain pressure. Or you could rig a defrost sensor onto the suction line that would cut the compressor when the evaporator coil froze. Either way would yield reliable operation.
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