Compressor amps are VERY sensitive to head pressure. Outdoor temp and total CFM are the major players, provided system charge or indoor airflow haven’t been messed with. Was the outdoor temp about the same for both tests? IMHO an ECM condenser fan motor doesn't make sense when used with a single stage compressor. At $136, it's not much more than a standard PSC motor so payback might be decent.
15SEER should be a TXV, the TXV will adjust to keep a constant superheat and be efficient under most operating conditions. Lower head pressures will typically result in a colder evap coil.
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