Well, I am just a dumb skier with little to no engineering "science"....... BUT.....
I ski on a river that is between 44 degrees F and 64 degrees F. Then ski tournaments on lakes that are 70 degrees to 80+ degrees F. I know that in order to have a working ski, I have to move my front binding ahead in COLDER water and back in WARMER water. Somewhat the same in shallow and deep water for that matter. I call it the cheap lawn chair test. If I fold like a cheap lawn chair on my off side, I have to move front binding back. I tend to use that as my "breaking point."
On fin, I tend to find my sweet spot and use the bindings as my adjustment. However, I do add DFT as it gets really cold. Possibly even remove depth to free the ski up a hair, but that is only on a winter set on my river. We are in the upper 50's right now and I have not moved my fin yet, just ahead an 1/8th from the private warmer ski lakes.