Easiest way to solve that is get the right stuff to start with... Spheroidised annealed O1 tool steel is readily available from - for example - Cromwell Industrial Tools UK: Discount Prices For Power Tools, Hand Tools and Cutting Tools - Free Next Day Delivery as "ground flat stock". Cuts easily, a doddle to heat treat and very tolerant of mistakes on HT, so you can have another go if needed.
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