I made the terrible decision of asking my letter writers if they would "write me a letter", not if they would "write me a good letter" because I assumed this was assumed. Big mistake which I was not aware of at the time. In hindsight, one of my letter writers (prof I did research under) said he'd write me a letter "if necessary," and he's generally a hardass, but at the time I didn't think anything of it as he did agree to write the letter and I'd done well in his lab. Fast forward to now and his letter is submitted at all 28 schools I applied to and I cannot remove it even though I get the sense due to what he said and his personality that the letter was not a positive one. I applied to 15 more schools without his letter after this realization, but is there anything else I can do? I can't change letters on the 28 I applied to. Should I not even bother submitting my secondaries to those schools? If I have to reapply, and a school rejected me because of this letter, will they have on file that someone wrote me a bad letter last cycle and auto reject me again? Any advice would be appreciated, thanks in advance.