A PWM controller is OK, a voltage step down box is a no-no.
Simply lowering the voltage makes the pump very "lazy" and at very low voltage it can stall.
A fuel cooler, as was stated, would be a very good investment in addition to the controller. Put it in the return line.
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1969 Chevelle
Old setup: Procharged/intercooled/EFI 353 SBC, TKO, ATS/SPC/Global West suspension, C6 brakes & hydroboost.
In progress: LS2, 3.0 Whipple, T56 Magnum, torque arm & watts link, Wilwood Aero6/4 brakes, Mk60 ABS, Vaporworx, floater 9" rear, etc.
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