I use a simple Weak Aura to track Chain Reaction. Actually, I created the WA using the preset tool of the addon.
I agree with your statement that Frost seems with all its talents, traits and passive not as straightforward to min-max as it may seems first.
I reckon managing CR is can be a mess but did you notice any increase in your DPS? I'd like to sim this rotation but I really don't understand anything more than the basic with SimulationCraft (and I'm nowhere near perfect in my rotation to test it on dummies and see its maximum potential). Maybe I should seek some help on Altered-Time since they seems very Sim-savvy.
I agree, I have yet to find a way to sort out everything and try to balance CDs, FoFs procs, CR procs altogether... But there must be some hidden potential in there .
But I think we would want to use RoF during the first 10 seconds of Icy Veins to benefits from Chilled to the Core for the whole 10 sec of channeling. Past the initial 20 sec, CttC is over and those sweet 20% aren't there anymore .
If only all the pro Mage that went Fire were Frost, we would have more in-depth research on our rotation ^^. (no offense to Kuni ofc)