Blue cabel started acting up so i switch to black. The stock tips where small instead of medium like the orginal. There zero distortion on max lv and there more subbass then before. Im try the comply tips to see if its diffrent because on all my other replacement they seem to be one size to small for the 900
More sub-bass presence is expected, it's what happened with mine. It'll go back down with time... What confuses me is the volume and balance issues you're having.