Something that I have learned when putting detailed touches on a track, especially when Automating parts to accent them or pull them back, that you should never Automate Mixer Channel Faders.
"Why not" you ask?
At the end of your project, you are trying to get a final balance on your mix and final Master EQ and other settings to render your masterpiece for sharing...
What I have found is that, if you want to Automate a Synth Machine throught your song, is to Automate the Synth's Output Fader (knob). Doing this frees up headroom and final control of that Synth's line level in the Mixer for touchups later, while still keeping your Synth's Automation untouched.
A few exceptions to this theory are if you use a Distrotion Effect on your synth (for a guitar or gritty nasty bass preset for example) In this case, Automate the Distortion Post-Fader in the Insert Effect section for that Synth Machine, still giving you final control of that synth in the Mixer. Also the Limiter Insert Effect's Post-Fader can serve this function.
Take this for what it's worth; from my perspective and experience, this will save alot of frustration and headaches, and speed up your workflow for your Caustic Projects.