Excessive cone excursion - winisd help

Hi everyone. Bit of a hifi novice trying to learn here.
Currently trying to design a MTM 2 way enclosure and I’m running into some issues with cone excursion and I just need some advice as to what to do.

I have 2 Dayton audio RS150p-4a woofers per cabinet that I plan to run in series and a Dayton audio DC28F-8 tweeter.
My friend advised that I should get an amplifier which can supply a little more power than the sum of the power rms values of all the drivers so I picked up a second hand NAD c372.
I’m now running into some issues in winisd where when I enter a higher signal value I’m getting excessive cone excursion at around 80Hz.
One of the ways I’ve seen you can manage this is a high pass filter. My question is wether this is the correct thing to look into doing and wether this goes into the crossover design or preamp stage?

Any help is appreciated