Where did you get the steel, I've never seen L-6 do that. I'm thinking you got some large band saw blade material, it isn't L-6 (some how a myth got started that they used L-6 in band saw blades, I've never found on single blade manufacturer that does). L-6 is very forgiving in the heat treat. I'm giving to think you may be running a bit too lean also.
It always helps to know what you are dealing with for sure. You've already got holes, did you anneal?
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