CFG++

Rescales CFG to work in the range of 0 to 1 making it work better at low guidance scales. It also makes the diffusing process smoother, and may lead to reduced artifacts. One usually accesses these by choosing predefined samplers, i.e. in ComfyUI euler_ancestral_cfg_pp is euler_ancestral using CFG++.

In my and Bex's personal tests:

• CFG++ samplers give eps-pred models a very good color range, rivaling that of what v-pred models claim to achieve.
• Using CFG++ to inpaint at high steps breaks the image for reasons unknown.

Note that in ComfyUI, the _cfg_pp samplers in KSampler are alt implementations where you instead simply want to divide the CFG you're used to by 2.
For example, if you usually run euler_ancestral at CFG=7, you'd run euler_ancestral_cfg_pp at CFG=3.5.
In practice, the reasonable range I find for these is CFG between [0.7, 3], and 1.6 is a sane default to start with.