I see you have Watt/Puppy 6. Before you buy up to more power, consider trying the Zeroimpedance.com Autoformers with your 75wpc stereo amp. I have the VK75SE and W3P2s. The 4x impedance multiplier of the Autoformer inductor makes the Wilson into a nominal 16 ohm speaker, which greatly improves the damping factor and makes 75W of tube power feel like big monos. You move the speaker to the high impendance taps! The Autoformers add no editorial affect that I can hear. This is an amazingly effective remedy to the amp/speaker mismatch.
Dave
Dave