Tboooe,
Though not optimal, you might consider taking your SF's to the dealer, and trying them with the LM amp. You can compare with other amps they have on hand, to see if they would make the grade in your home system.
For what it's worth, I drive my custom Tannoy HPD's with my SET 300B (using EML 300B XLS tubes), and a factory-upgraded VAC PA 35.35, which is a 70+lb. beast. The SET doesn't short-change the dynamic side of things in any way, and just sounds more like music.
The above may not be pertinent, since the HPD's are 94db sensitive, but to me it shows a good trial might tell the tale.
Regards, best of luck in your amp search.
Dan