Could the detail your finding be some what related to the amount of content the 125s are getting to play? As in real world unless your really into Hiphop/Tecno or pipe organ. There really isn't a whole lot of content in the sub 20/30Hz region? So the 125 should have more content to play in general.
For me you could say I had a competition between SVS PB1000 and Paradigm and the Paradigm smoked the SVS!!! My Anthem ARC fell behind the sub and snapped the LFE right out. Total K.O.