IMO, it is way mid heavy. First thing I'd do is dial back the midrange a bunch. IMO it sounds much better and frees up some amp power for low and high end.
Past that, I just think it needs a sub for low end reinforcement.
I have a sub, amp and an Audiocontrol LCI2 that I will install one of these days. The LCI2 allows you to tap the rears for signal and provides a remote power as well.