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Definition gets quite tricky. It's set by the profiling process but can be altered after the fact. Many times a tightening boost in front of a modern high-gain amp will cause this to be set to max (10). It's very similar to a pre-distortion EQ, darkening or brightening the signal to adjust the relative balance of how the fundamentals vs. the overtones are distorted. While it works well for a quick tweak, I find it's no replacement for some finely-tuned parametric EQ in front the amp. If the tone sounds a bit too harsh or thin, try turning this down, then using a Screamer or pre-EQ to add back any needed tightness or high-end saturation.
Power Sagging affects the dynamics and feel of the amp, and can help get mutes to sound right. If the amp feels a bit too stiff and fast, try turning this up. A small tweak can make a big difference here. I commonly use values of 0.4 - 0.9. You'll know you've gone too far when the your notes start to sound smaller, less powerful, and more nasal.
The Pick setting I find I usually like to leave alone; however, every now and then I'll bump it up or down a bit. The same goes for Clarity. While many love this setting, I find it takes away from the real tone of the amp and makes everything sound like a similar crunchy tone. Where I like to use a touch of Clarity is with a highly distorted tone. Sometimes to get that super-saturated chunk with the crisp high end shining through, you need to use a lot of gain, and things can get mushy. Clarity at ~1.0 can still sound quite natural but keep more definition to the tone without giving up saturation.
Turning up Tube Shape can add a bit more bite or edge to the distortion, like you are pushing the power amp harder. I often like to add a bit here, but it's important not to overdo it. Tube Bias is similar, although I find this one a bit trickier - it seems to add volume as you turn it up, which can lead to an instant impression that higher settings are better. However, too high can make dynamics become artificial-sounding and the tone a bit harsh.