High vs Low Tempering?

By any chance did you ever have any experience with M4? I'm making a large knife right now and was just going to run with high temper since the seal on my dewer broke and it doesn't hold. If it makes a big difference I can profile a sheet of M4 that I have been sitting on for a few years so it's worth the expense of having the dewer filled for a single HT. I finally moved into a place where I have power for my oven again.
I don't know.
 
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