Why you don t try to HT strip of AEB-L ? I mean you will cut/grind shape knife after HT ? It works for me , I never shape tang / say for hidden tang style knife / because I notice same thing .............With all the shim-clamp-tempering and carbide hammer whacking, we shouldn't forget about good old fashing bending. It can fix a lot. I had 180 mm nakiri (2.5 mm 14c28n 61 hrc) come out like a steel colored banana a while back. The vast majority of that warp was fixed by sticking the blade in the vice, jaws slightly open, and then pulling on the tang multiple times. The warp was mostly in the tang/blade junction and the curve was long. With shorter curve warps towards the tip, I think the carbide hammer works best.