Question on Gallo Reference 3.5

The 'SST' 'SST²' will sound better than your 4B.
The 7s will have more power, and work well. The 'power handling' means what the company would suggest as the power needed to really play loud.
The only danger with having a lot more power avaialble would be in accidental situations. Say a party and a drunken partygoer cranks the volume to max.. that could blow up your speakers.
With only 350 available, no damage. With 600 avaialble damage.

But i repeat, in normal use,, no problem using amps wit hwell over the recomended power. A LOT of folks use amps which are bigger than the speakers need.

I use a Bryston 4B-SST² amp. and am happy with it.
My future plans include going to Magnepan 20.7 speakers, and all i am going to use is my 4B-SST²amp. It has all the power I need.

You have more than enough power now, more is not going to help. I suspect that what you are beng limited by is the Bryston. Those are phenomenally well made amplifiers, and with an amazing warranty, but they are a bit sterile, in my experience.

Listen to ZD, something like a BAT VK75SE, or Pass 60.5's would offer a lot more for your solution.

ZD542, thanks for the input. I'm using the matching Bryston BP-26 Preamp and power supply. Elizabeth, I'm actually currently using a 4BSST, and you answered my question, so that's much appreciated. And thanks, Nightfall. The Bryston system is my first high end system (I had NAD stuff before the Bryston), and I'm thinking I'd like to build an entirely separate system that will incorporate at least a tube preamp, if not amp, just for a different sound, or may upgrade from the Bryston stuff in my current system.

Was using a Gryphon integrated amp which was ok but these speakers are sounding waaay better with a CJ tube preamp and a ATC power amp