Power resistor dealing with quick high current surge
Any other improvement I could make?


There are resistors specifically designed to handle surges. In fact all will but, few have the information in their data sheet that allows you to make the right choice. 

For instance, the Bourns CRS0805 range of surface mount resistors have a nominal power dissipation value of 0.25 watts but, the data sheet tells you that if the surge is no more than 1 second, the power can be a little over 1 watt. For 10 ms the power dissipated can be about 10 watts: -



So, if you choose the right resistor you’ll get the info you need in the data.

I’m not saying this range is suitable for your needs of course; just look for resistors with surge handling capabilities and inspect the data sheet for the power vs duration graph.