Legacy specs "in room" sensitivity, which is different than most companies quote anechoic sensitivity. In-room sensitivity adds in the room's reflections, to make about 1-2dB louder than anechoic sensitivity depending on type of room construction and materials and decor. Theoretical maximum room contribution is 3dB, that's probably what they add for their spec, so when comparing Legacy sensitivity to other speakers measured anechoically, subtract the 3dB. We listen in a room, so in room is real world sensitivity, but we all have different rooms, so it's impossible to compare in room sensitivity, while anechoic sensitivity is more comparable, if nominal impedance rating is also considered.
No problem on the 35w Luxman. James Edwards has similar luxman on his Focus, works great. All big Legacys have low impedance dips with negative phase angle in the bass, and it draws a lot of power but it's is part of their successful recipe. But for moderately loud levels a very strong 35W like luxman should be enough. If you have loud dance parties or listen to loud rap with long low bass synth tones right in the highest current freqs, or if you play loud uncompressed music like symphonies then I'd go for 100W+ SS amp. But for normal loudish music listening <95dB it should be enough.
I listened to my Focus 2020 for a long time with 50w tube amp, which had less current than the 35W solid state Luxman. I loved it, very satisfying. But it did distort and damage tweeters when I played loud dance music. Solid state can source current much better than tubes, so less of an issue, to a point.