Tube Amp Rec for 85db Single Driver Speaker

I'm currently using a pair of 47Labs lens speakers which are 85db but only a single driver. I had tried SET but there wasn't enough dynamics, I've tried solid state, a Pass Aleph 5 but I'm missing the tube depth and air. I can't afford the 47Labs Gaincard and Power Humpty so I'm considering a higher power tube amp. Any recommendations?