Totally agree with it .TY for an opinion but have you heard HE-7 MKII or HE-7, master-7 with the oscillator upgrade? Accusilicon 98/90 is plenty enough to delete the bloatness of the bass. My HE-7s started with bass as you described but after a firmware and oscillator update it is a whole new sound without any problems in bass region.
It's the same case with my HE-7.