Hello everyone, i've been reading on the forum for quite a while and been inspired by the Japanese knife family. So when i could resist anymore i ordered a 180mm tojiro shirogami deba and a 195mm tojiro shirogami usuba. Now when they have arrived one question arose. The usuba is dead flat on the back (the spine against flat surface). However the deba is (severely) warped. Would this be acceptable to you guys or shall i have it exchanged? Or is this a "on purpose feature"? Thanks for any comments!