Cameron,
I know exactly what you mean by hot bass even when your sub is off. I have the same issue. I use an 80Hz cross-over between my 80s and 600. With the sub off and the main gain set to about a half watt per channel, my 80s produce 96dB at 80Hz. That is way too hot frankly.
The reason you and I have this problem is due to room modes. Room treatment may help but frankly, until I better understand exactly what it is that I have to do to treat it, I'm not spending the time or money experimenting. If you figure it out, certainly let me know.
