Abill,
My system is similar except I have the Total EclipseII speakers(possibly an easier load?) in a 14x 25x8 room that open into a 16x 25 space. I have no volume or sound pressure issues. However I do use the Coincident linestage which is a very powerful sounding with wonderful dynamic scale and gravitas. This linestage combined with the Frankenstein is superb! i most often listen to jazz,small combo and big band, both sound great. When I do occasionally play larger scale classical it handles it well, no congestion and maintains a sense of ease at 90-95db levels.
If large scale classical is your main music fare, then a bigger amp would likely fit your needs. The linestage will also make a significant difference. There are some trade offs,there are amplifiers with more power but may be hard pressed to equal what the Frankenstein does so well.
Best of Luck,