True, the STP75NS04Z has a Vgs of 2 to 4 volts, so it may not try to turn on at all under 4V. In-fact, it does not see full turn-on (minimum Rds) until 10V at the gate. If using 3V3 drive, I would suggest using a different MOSFET designed for proper operation at 3V3 gate voltage. Another solution would be to add a proper gate driver to the circuit and keep the STP75NS04Zs.
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