I think my biggest problem with overheating is having a shotty thermometer. I think I should invest in better one.
My coffee soap that I didn't have overheat I use a bigger mold and I didn't insulate at all. Poured it and threw it ontop of the fridge in the mold and left it for 24 hours. It turned out great, its nice and hard. No speration or cracking. And it smells great. Sort of like a mocha. Coffee and a little bit of bitter chocolate.
My second batch I soaped WAY to hot. I soaped at 150 degrees because I was getting impatient with letting the lye cool down. Then I went ahead and over insulated it. When I unmolded it there were huge oil pockets. So I just threw it in the oven and rebatched it and it worked pretty well. I much prefer the texture of a CP soap that hasn't been rebatched.
The second soap I am not entirely sure what happened. I soaped at 115F. And it poured great and it traced before I poured. I threw some clingwrap on the top and put it in the oven that has been heated to 170F I believe (the lowest temp on the oven) then turned off. When I checked on it in an hour later to make sure it was setting up it had turned from a nice thick looking pancake batter to chunky oil. Oil was rising to the top and it was for the most part liquid. I threw it in the freezer hoping to save it but when I went to cut into it the next day it was oozing oils. So I rebatched with a splash of milk in the oven and now it seems to have saponofied, just a little softer then it should be from the added milk but that will come out over time.
EDIT: TikiBar An earl grey tea with Bergamont EO would be great! Maybe even a dash of tea tree oil as well.