Bloated and dark = turn down the master volume. Again, for more modern rhythm tones ( which, this amp blows for, fight me), you want the master volume low….there was a whole thread about this where I commented on this and many found it helpful, it’s worth a read. I couldn’t care less what the wiki says, I know that amp in real life and running the master higher CAN sound good for leads, less modern tones etc, no doubt. But for what you’re asking, run it lower. 9 o’clock or so. You can try lowering the grid bias a bit as well, this is something that many found helpful in that other thread as well.