P-Channel Mosfet overvoltage protection using a TVS
I am not sure that 1N4733 is fast enough to protect the MOSFET. I wasn't able to find any figures regarding it's speed - so it's probably not tested nor controlled. These transients are in nanosecond range - and it's really hard to do anything with them, other than have a resistor in series. 

One possibility in current circuit to keep MOSFET safer without resistor is to pick part with higher Vgs in the same package, it should be at least double source voltage without resistor : signal reflection doubles voltage, parasitic inductance can drive it even higher.