i disagree, anything over 100 percent is risking injury which you dont want to have. the fact is by working in the proper rep range at 100% with proper form, you will see results and there is no need to go over that risking injury and putting alot of tensiona nd pressure on the joints.
what do you mean your body is just going to be good at that exercise at that weight? you will increase in strength with that exercise given the proper rep ranges, not sure where your coming form with that comment.
your 2nd comment i highlighted does not make sense otherwise overtraining would be non existant.