I won't directly answer your question, because I can't. Scanning color film I have no clue what I'm doing. I scan it, work it until it looks like I want to, and print.
What I can tell you, though, is that it's easy to maintain chemistry temperature. All you need is a water tempering bath and a good thermometer. When I develop C41 film at home I simply put my chemistry bottles with the water bath a little too hot and keep it there until the chemicals are roughly at temperature. Then I let the temperature drop to the correct processing temperature, and then I slowly pitch in hot water to keep the temperature right where it needs to be.
I can't tell you if my results are fantastic, but I can tell you that I see no difference between what I process and what the lab processes. And for sure I'm able to keep the temperature dead on accurate throughout the whole processing cycle.