Baroque_lover,
Thanks for sharing your speaker info. I used to have a pair of Accoustic Zen Adagio speakers which are similar to yours. My 50Wpc KT88 monoblocks drove them with ease.
The much larger woofers in my JM Lab Alto Utopia need more current to drive. Consequently, you need a higher power amp.
Saying an amp is too powerful is like saying a car too fast, a girl too pretty, too much money, too much fun, etc. :-)