Wharfedale Moviestar 70+ System "yamaha 80 amp" Questions

...on the yamaha to anywhere from 80-120 ( the 120 will put more bass to the sub) if your yamaha has sub level/volume control set it higher, also if it has LFE/sub out set it to sub only. Good

Yamaha RX-596 stereo reciever (80 wpc @ 8ohms), there was a very small improvement. I suspect that the problem I am having is a combination of poor damping factor rating of the amplifier combined with