@billy_idle @danb - you're both right, I'm being deliberately obtuse and even a tad argumentative.
In truth I love rebuilding and I love messing about with spreadsheets. I also try not to forget that I'm one of the very small minority of vapers who's prepared to spend time on this. The broader community needs to be represented and TC in particular is an area where many vapers are struggling to find relevance or benefit.
I think KISS will win the day in most situations and this isn't it. I do see a day when users will simply put on an atty, select a wire, set the desired temperature and start vaping. Today, we are where we are.