I think you are correct about overkill. There really is not a lot of musical energy in sub range except from pipe organs. I find movie booms rather overdone and frankly irritating these days.
Part of the issue is the inherent basement acoustic efficiency of most subs to reduce the form factor for domestic tranquility.
If you use physics to your advantage and don't try to fight it, you get as much and as deep a bass as required with remarkably little power.
So I have four 10" drivers in two transmission lines that are not actually sub drivers, but ideal for my application. That is up front, and there are two lines in the rear with two KEF B139s in each that extend well into sub range at power.
In the front lines the sub outputs are mixed in.
The amps powering these never break a sweat.
I was playing this recently and the 32' pedals were shaking my chair and the floor. It was downstairs as well and my wife came up to voice complaint about shaking downstairs. That is the trouble with deep bass it really leaks. That is with this rooms integrity beefed up and the walls all full of dampening.