20 years ago, I don't even recall this conversation. Maybe farther back than that
10 years ago, folks were saying a minimum of 400 gr. and foc was rising to the surface.
Now, 500 gr minimum and plenty of foc or arrows bounce off of elk
I seem to recall quite a few photos of dead elk before I'd heard of any of this. Maybe everyone was shooting 500 gr and just not talking about it.
With that said, I do prefer a heavier arrow and the current trend of heavier arrows and FOC discussion is a good one.
I'd add a good broadhead upfront of your current set up and hunt with it. If it doesn't turn your arrow into a noodle, you could go with. 125 up front instead of 100.