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I would go a little higher with the steel temperature. 825. And a shorter soak.
Your oil is just fine. The cheapest corn oil will do.
Also, how quickly do you get from the oven to the quench? This...

That looks pretty good. The etching came out very nice, and I like the pattern on the handle.

That settles it then. I probably quenched too cold. I'll have to buy a cheap fryer and mount it my quench tank

That could very well be. In that case you could use a deep fryer to preheat the oil and quench in that.
In any case, no matter how you quench, the difference between the mild steel sides and the...

I take a big chunk of mild steel, bring it to red heat, dunk it in the oil and stir it around. I think it is about 50 degrees celcius.
With ripping apart, I mean that the mild steel sides will...

It is indeed pretty much like O1. However, there are a few details you may want to mind. Firstly, you want to preheat the oil. Secondly, you will want no sharp indentations where the thermal shock...