6 amps @ 120 volts sounds about right for a 1 ton compressor. 720 watts input power. 12000 btu heat transfer divided by 3.4 btu per watt equals nearly 3500 watts heat transfer. 3500 watts divided by 720 watts equals nearly 5. Did I make a wrong assumption somewhere? Sounds about right for a w2w heat pump: cop around 5, eer around 50/3 or 16.67.
You're not going to save much electric power by swapping for another compressor rated for the same capacity. You may pick up some mass flow through the compressor if your hx's and metering device react favorably to the new compressor. Assuming it is not modded already, another compressor may or may not bring you to a higher level of efficiency.
If the unit is cap-tube metered, and has relatively small heat exchangers, you may be better off installing a smaller compressor and some tx valves to reach your target cop at the same heat transfer rate.
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