You wrote:
"I'm a rocker and I do some jazz once in a while. So what do I do to get the most from what I have? ... Do I go after more power? Buy a better speaker? Move the system to a smaller area? Gee, this isn't very easy!"
I have to assume that you want to use your large room as your listening room, and if you like to listen to rock, which requires scale, it's your best option, so let's take that as a given.
Your Focals are very good speakers, but, regardless of the room, they are not suited to really large scale music like orchestral or rock (in fairness, very few speakers are). I will assume that you have a speaker budget of approximately $10k. To do rock 'n roll with Focals, you need the Nova Utopia BE or Grand Utopia BE, both of which are very expensive even when purchased used. WattPuppy 6 to 8's are also "rock" speakers, but they, too, are too expensive (and I hate their tweeter). Two speakers available used for $10k that have finesse, a lot of headroom and that will work with your amp are the C-4's mentioned above and Escalante Fremonts, which I run. The Fremonts, especially, will work with a 150 watt/channel amp, as they are highly efficient (a true 93 db.) and will knock the walls down with 100+ watts/channel. If you are in the NYC metropolitan area, you are welcome to come by and hear for yourself (I drive mine with either a 70 watt/channel VAC Renaissance 70/70 or a 125 watt/channel darTZeel, both of which yield superb dynamics).