I do have the volume level of each speaker matched. Sounds like the large two channel amp will work out fine. I too have heard that the Jag's love power.
I guess I was thinking of when you are only doing two channel listening that the additional power in terms of amps/current/watts could be noticeable in terms of the amp being able to recover from dynamic swings quickly. The Jags are an easy load in some ways (down to 4 ohms), but only 86db efficiency.
The increased power I got by moving to Odyssey Mono Extremes monoblocks from a Musical Fidelity A300 (150X2) showed up by a more controlled and relaxed sound.
I doubt you will hear a lot of difference in HT application.
I also use Jaguars as mains and the front channels in a HT setup.
I rarely watch movies, though.