First Watt F8 running at 6 ohms

The F8 manual lists the following:
Output power 8 ohms 25 watts @ 1% THD, 1KHz
Output power 4 ohms 15 watts @ 1% THD, 1KHz

Is it a correct assumption to say a 6 ohm load would be somewhere in the middle?
Anyone run the F8 with a 6 ohm load and have any feedback or observations?