Reducing my 401k contribution because I max out early?

2024 is the first year that I made enough money such that I maxed out my 401k early, specifically sometime in late September. I have been contributing 15% and my last several paychecks of the year were pretty healthy.

I did some simple back of the napkin math and found that I can lower my contributions to 12% and still max out my 401k, but give myself a little take home pay raise. Is there any reason what so ever not to do this?