800w is pretty underpowered? Into a 610hlf? Did you turn up your gain knob? I used to run my 610hlf with a 500w ss. I fart that thing out at about half volume. Flat eq.
When I first got the tt800 I plugged it into the the 610 first and was like yeah, this is good. Then I started playing around with different cabs and plugged my old bass cab in the 118 and was like ooh yeah. Had to turn the volume down, great sound. Maybe something is wrong with the 610 don't really know. Now that I have the 215, again it's like ooh yeah. Those two cabs are on a different level of sound compared to the 610. Again, maybe something going on with the cab. I ran that cab through a 400 watt ampeg head and it always just sounded okay.