Hmmmm. I went into my nvidia config tool and sure enough, it's locked at 60 Hz. I had no idea that fps could not exceed driver refresh rates, though. I have the option to change it, but only after the driver warned me that very bad things could happen to the hardware.
Based on this new info, I think I'll just leave it the way it is. 60 fps is plenty fast, and performance is excellent until I add hundreds of thousands of triangles.
Thanks Amos! (and Marvin, of course!). It's like you guys have a contest going on to see who can be the most helpful.
By the way, we've decided to switch from jME to Xith for our engine, based on ease of use and very similar performance.
Expect more questions

Thanks again,
rbivens
You're welcome !
Great to know you did the jme-xith switch !