7 to 10 watts is less as 1.5 dB extra, not even noticed on the other side.
just raising the carrier power will make the modulation weaker...
Best way to up that power is to use a good amplifier, and leave the Galaxy for the factory settings.
I see a lot of peope tinker to get the last milliwatt out of the standard transceiver not realising they stress the parts above the factory specifications and with the already inadequate heatsinks risk overheating the parts till they go bust.
To make a difference doubling the output power is barely noticed, 4x the poer is 1 S point and can be heard quite well.