That stinks about the Software settings only going to 10 watts on Mac.

Maybe in the next firmware update they'll address this. I kind of doubt that re-installing will help, but give it a shot, you never know and it couldn't hurt. I would do a complete uninstall first though. I have noticed my eVic limit itself. For instance, in straight VW mode, I just had my AGA-T (2.4 ohm coil) on and my device and it would only go to 10.4 watts (on the actual device, not in the software), but when I replaced the AGA with my Phoenix Bully (2.1 ohm coil) it would go all the way to 11 watts. I'd try replacing your atomizer or whatever and attempt adjusting settings again and see if it makes a difference.