Looking at the specs of your speakers they dip below 4Ohms with difficult phase angles, so some of your amps may well not be up to driving them fully. Here’s an exerpt from Stereophile’s measurements of the Sonetto V G2 that likely has very similar specs in terms of its load on an amp…
The Sonus faber loudspeaker’s voltage sensitivity is specified as 89dB/2.83V/m; my B-weighted estimate was 88.6dB(B), which is within experimental error of the specification. Sonus faber specifies the Sonetto V G2’s nominal impedance as 4 ohms. The impedance magnitude (fig.1, solid trace), measured with Dayton Audio’s DATS V2 system, remains above 4 ohms for most of the audioband, with a minimum value of 2.9 ohms between 90Hz and 100Hz. The electrical phase angle (fig.1, dotted trace) is high at low and very high frequencies, which means that the effective resistance, or EPDR (footnote 1), drops below 3 ohms between 43Hz and 46Hz, from 65Hz to 203Hz, and above 4.3kHz. The minimum EPDR values are 1.95 ohms at 34Hz, 1.26 ohms at 81Hz, and 2 ohms from 6.5kHz to 7.7kHz. The Sonetto V G2 is a very current-hungry load for amplifiers.
This is a hard load for even a higher-powered tube amp, and I’d be looking at a hybrid like a Unison Unico 90 or 150 with a tube preamp section and solid state amp that can give you that tube goodness with enough grunt to drive your speakers properly without having to work too hard. No amp sounds its best when it’s pushed to near its limits. Hope this helps, and best of luck