That's exactly the year of 2nd gen Prius I was looking to get since that year received a mid-model refresh and included more features as standard. I ended up owning a 2012 plug-in for a few years instead.
Welcome.
The mods you mention are all that I had performed. Probably a wheel alignment would be the next best thing if it hasn't been done in a while, along with over inflating tire pressure.
It's pretty difficult to squeeze more efficiency out of the Prius since they had engineered it to be efficient regardless of how it's driven. Minor mods will return meager savings.
Someone on here had gutted his Prius to save weight, and there's a thread detailing all of that.
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