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I don't know what you mean by the corner being cut off of it. But, to fix it, simply remove the chip. That will put you back into stock setting. From there, you can buy a proper chip with custom tunes and you'll be feeling much better.
Get some pictures of what you're referring to being cut off. If it's part of the ECU housing, that's normal, and won't affect anything. Since you've been noticing a steady decrease in performance, I'm guessing something else may be the culprit.
2002 F250 CCSB 4x4
PHP Phoenix, John Woods VB, NUC bypass, 6637
"No country can be called free which is governed by an absolute power;
and it matters not whether it be an absolute royal power or an absolute
legislative power, as the consequences will be the same to the people."
--Thomas Paine, Four Letters on Interesting Subjects, 1776