I remember reading a post somewhere on another site that they measured about 4.82 watts output on high power. That was done on 2 radios that were taken apart to the point they could capture the TX power at the base of where the antenna would be. There were a couple other tests done such as frequency deviation, RX sensitivity, and battery life, and all were very good but I do not remember those specifics since I was mostly impressed by the almost 5 watt output. I tried for the last hour or so to find the site, but no luck yet.
Since they are capable of almost 5 watts, then the low power setting might be able to be removed on the FRS portion. I may even try to use these on the 70cm ham bands since I am licensed there as well. All I need to do is find a suitable editor, but the ones I have looked at so far do not have the same layout as the one you used so I will try Hex Fiend and see how far I can get with it.