Now wouldn't that make the hump worse, since you starting with it on
the outfeed, going to the middle, stoping, and flipping, and doing the
same thing again?

Would make more sense to push the far end down so the board does not
touch the knives, go about 1/2 way, then flip and repeat. I would
expect this to knock the hump off.

I've not tried the flip with a hump.

Alan