On frequent occasions, I feel my form fall apart on tougher sets, but I finish regardless of my form. I feel it is more important to force my body to undergo the physiological adaptation resulting from these "near death" sets than to worry about maintaining form.
As long as I imprint the correct form in less strenuous sets I feel it is OK to gut tougher sets out when my form is falling apart. Many times I finish my workout with some shorter repeats to finish and leave the pool with the correct form imprinted in my mind.
This post is as a result of one of today's sets where I simply did not want to "give up" and switch from fly to free. I felt it was important to finish it the way I intended to give me a metal boost that I can do it as well as force the body to adapt. Is this mentality towards training wrong?