Ubuntu :: Increasing Mouse Speed On Startup?

I have a HP Mini 311c that has an ALPS touchpad. Linux Mint detects it as a mouse and so when I try to increase the speed of the mouse, nothing actually happens. I've created a script which includes just the following code:

#!bin/bash
xset m 5 2

This is saves as startup-script.hl on my Desktop. I then go into Startup Applications and add the script in there. But when I reboot my Netbook the mouse is moving at its default slow speed. I've ensured the script file is allowed to execute (right click > properties > permissions) and have also tried copying it to the init.d folder with no luck.

One thing I have noticed though is that straight after I login to Mint the mouse cursor does move at the speed I want, but after a few seconds reverts back to the slow speed.