Bass/speaker excursion issues

OP

You are living in a darkness born of myth, and I wish I could point you to all the threads on A'gon that go something like "omg, I raised the crossover point on my speakers and they sound so much better!"

The higher crossover point minimizes distortion by leaps and bounds and it is completely a positive thing.

Raise your x over f to 80Hz and or increase crossover slope if you can

If your speakers are ported and small plug the ports.

You may or may not like the end result, but excursion below the port f should be reduced