My experience says that for most people, usually, overpowering subs doesn't really gain much, especially for daily or music. Actual power levels to the sub can vary wildly while playing music, so things like sub box size and tuning and cab resonance and whatever the weather is like that day can all change actual wattage to the sub, so overpowering a woofer is quite a complicated equation. In some cases, overpowering by a little bit seems to help by maybe limiting amp stresses, where the amp doesn't have to be turned up all of the way, but too much and it can be really easy to blow subs as all the variables change, like what song you're playing, the way any change in air changes resonance frequencies. How much power you have is going to be largely based on frequency based impedance, and it can vary so widely. That's something I tried to account for box designing was somewhat of an average impedance change, where I tried to limit how much stress the amp sees from sub movement, and limit that to get more consistent power across a certain bandwidth for the music, if that was needed/wanted. It's a balancing act of all the factors, lol.
Pure SPL is just a whole different question with overpowering.
I would say if you want to overpower your subs by a ton, just get better subs that can do more bass more efficiently with that power, stronger motor, etc, and make sure your box is always the best. Box design has a massive impact on woofer power handling, so keep that in mind. I tend to tune almost solely by ear.