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Plus anytime you get more draw as you described in the OP you have a short. A battery is a simple energy device. It doesn’t magically have more power 20 seconds later it has a better current flow 20 seconds later. If you heat it up 10 degrees it will have more power, but if that was to happen instantaneously you wouldn’t have a battery anymore, it would now be called a bomb. Get out of there it’s probably gonna keep rising and your car is about to get an acid shower.
Sorry for writing so much but with that much extra draw, the culprit almost has to be the starter or cable. Nothing else really draws enough power for it to fall off so much. The wires aren’t big enough to carry that much. They would usually burn up a bit and you would smell them
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