your amp list are all too good for these loudspeakers
This was my 1st thought. FWIW at 100 db efficiency you should try a lower watt tube amp like the Black Ice or Bob Latino’s ST 70 or 120. I had the later running on my 93.5 db Sens. speakers with very good results. The 35 wpc replaced a 250 wpc behemoth from a very noted mfg. With speakers like you have high wattage is not really as good as low power IMO and others.