Your system is very similar to mine and I have no issues with the 75SE running out of steam. In fact the meters rarely deflect to mid point except at unpleasant volumes. Before buying new speakers try to get a loaner on an ARC Ref 150 as means of logically trying to diagnose your concerns of inadequate power. Keep the variables to a minimum to achieve useful, interpretable, results.
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Wilson Alexia V; ARC Ref 6SE; ARC Ref Phono 3SE; Boulder 1160; Esoteric K1X; Artisan Fidelity Garrard 301 Statement; Ikeda 407; Koetsu Leopard, Coralstone; Shunyata Denali 6000T; Shunyata AC cables; Siltech Prince speaker cables; Siltech Princess interconnects, Avondale II phono.
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