With all I have found it doesn't make any sense that any of the alloys used in the stuff should even be close to having a problem with 350F. All of them have melting points well above 350, tin 449, bismuth 520 and lead 622. I am not sure if the head is getting too hot or what but my stove is right on. I will admit I don't know diddily about the temp the jig heads get or their heating qualities so maybe they do hotter than 350 in the oven.

Oh well, will stick with cooler curing temps just to avoid any problems.