We rent in a two story place (one flat upstairs and us on street level) and recently the water reduction valve for the property was adjusted to get more pressure upstairs. As a result we have very high water pressure through all our taps. Plus the tiny rubber like nozzles on the existing shower head are disintegrating and I'm sure it's outputting a lot more water than is necessary i.e. higher electricity bill.
What's a good low flow handheld shower head? I gather the main difference, to make them low flow, is combining the water with air so you get a similar stream but less water flowing through.
I currently use Methven shower head (2nd hand off trademe) and been great. I believe I have mains pressure which should be the same as your "high water pressure" but I'm a novice DIY so perhaps somebody can chime in on that.