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Precise color mixing is something I've always found tricky, especially without running out of room on my wet palette. The more I paint the more I want exact control over chroma, hue & value and to vary all of them by design rather than by accident.

Do you have any practical tips for mixing colors? Like how you go about arranging colors on your palette for instance, or how you control all three color variables at the same time.

So starting off, you are going to have to define chroma, hue and value; depending on what you read they differ. Once we all have clear meanings, we can go from there.

Hue I assume you are referring to what we typically think of being colour i.e. red or blue, and value as what we would think of brightness. What do you mean by Chroma? Are you going with it being "colourfulness"?

My next question is what are you painting? Can you mix on a scale that involves bottles or do you have to mix on the palette?

For flip tops, perhaps use some kind of stick or spatula to move exact amounts of paint to the palette, then you can accurately control ratios?

Personally I just do it by eye, and my mixing area is usually less than an inch square. But it wouldn't be easy to replicate, I'll concede.

A few things.

1. Keep a paint journal. Keep track of your ratios and put a dot of the color on the page for reference. This comes in very handy when having to repair a model or if you have to come back and recreate the paint scheme on other model a few months later.

2. If using pots pick up some transfer pipettes (aka eye droppers) they are cheap and let you control the amount of paint your using.
http://www.amazon.com/Plastic-Transfer-Pipettes-Gradulated-Pack/dp/B005IQTSE0/ref=sr_1_4?ie=UTF8&qid=1446991342&sr=8-4&keywords=eye++dropper

Buy some dropper bottles and mix larger quantities at once.
And keep a record of the mix at hand..
A painting journal..