It totally works for accuracy, almost all of the heat loss is stopped completely, or the opposite in your case I guess :-)

What I ended up with was to check the temperature maybe every third or fourth agitations, and then after a while getting the routine to keep it all at 1/10th of a degree Celsius.

As far as I could judge back then the E6 came out VERY well, better than some of the cheapest labs, later I used the best commercial lab & the result seemed the same :-)

These days E6 is done for in my case, but I do get some C41 done here locally, the commercial scans are actually very good and super cheap