You didn't do anything wrong. The amount of power the amp can produce is one thing. What your speakers demand for power is another.
Your CV's can only use about 10W continuous, and 100W for brief fractions of a second during the time they are using 10W all the time. If that much ... it's probably less, actually. But, in my experience, any amplifier that can produce 100Wpc into 4 ohms is all you need for those particular speakers. The speakers will never demand more than that from the amplifier, so that's all the amp has to deliver.
You could hook it up to an amp that produces a million watts ... still going to only be able to use 100. No getting around that. They go so loud with so much power, and adding power doesn't change that. It's simply unused power.
On the Bryston 4BSST there are two green lights on the front panel. Those lights turn red when you clip the amplifier (ie run out of power). That means if you can't get them to turn red in stereo, going to mono isn't going to solve anything.
If you just see them briefly flash red but stay mostly green, that means you are just barely getting them to use all the available power in transients ... those brief periods I talked about. The continuous demand is typically about 10x less.
With 4 ohm speakers, like your CV's, the 4BSST will produce at least 500W RMS. Bridged into Mono it will produce more than 1000W.
So, with your speakers, a brief flash of the red in stereo means you are using about 500W for brief fractions of a second, and about 50W all the time (continuously). Obviously, you were nowhere near using 50W continuously.
Therefore, since your speakers can't even handle all 500W, there's no point in trying a thousand. That's what I was getting at.
By the way, if you do try to run them harder than they normally demand, they will just blow up. Don't bother trying. You've experienced as loud as they will go, because you used an amp that has more than enough power. They won't go louder no matter what you do.
