Sorry to disagree, but 3.2 horsepower should be plenty to start the compressor - even at 90psi. I have several smaller compressors that run similar pressures - only at smaller volumes and smaller tanks. Two are running on 1 to 1.5hp motors.
The cut-in pressure should not be the issue. Starting capacitors or starting windings/contacts are of more concern. The unloader should make the cut-in pressure irrelevant. Motor should not be under any extra load when it starts, as it should not be under any pressure until it starts running, and then not until it builds pressure in the line to the tank pressure.
The real issue in this case should center around the starting circuit in the motor.
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