Okay, the wobbles. I run two 5 gallon SS kettles on my Flat top stove. One has an indention in the center on the bottom, and does not wobble. One is flat and does wobble. Does yours stop wobbling at around 180, or if you push down gently on it?
(Mine second pot was free from northern brewer. Spend 125 get a free pot. doubled my output, since adding another 5 gallon batch at the same time adds on only 1/2 hour)
My 62qt Bayou wobbles in a certain range. 180 would seem reasonable as it only does it as I approach boil vs heating strike/sparge water.
Can you show a pic of that indentation? Curious if it's something I could do to a flat-bottomed pot myself.