If you ramp up rigor in 11th grade, and apply to colleges in the fall of that year, they will see a transcript that looks like this:
9th grade: Regular high school classes
10th grade: Regular high school classes
11th grade (IN PROGRESS): Big increase in number of classes and rigor, including a large number of AP classes, but no grades yet, and no AP exam scores
Until they actually see your grades for that final year of HS, colleges would have a reason to be concerned that you might not be able to handle the big jump in rigor. Just being enrolled in a bunch of APs doesn’t necessarily reassure colleges that you can handle these classes.
I think it would be much more reassuring for colleges to see a transcript like this:
9th grade: Regular high school classes
10th grade: Regular high school classes
11th grade: Increase in rigor with AP classes; good grades and good AP exam scores showing that you can handle this increase in rigor
12th grade (IN PROGRESS): Same or increase in rigor compared to 11th grade