I think you are giving postmodernism too much credit. It's whole premise is a non problem. Looking back on it's history, it's a politically and religiously motivated ideology to push anti-enlightenment values that coated itself in esoteric language to avoid scrutiny. It's not a well thought out philosophy, because they reject the very thing that would allow that to happen, reason.

Empiricism solved this issue. You will very quickly learn if your assumptions are wrong by testing them in reality. This is what is meant by "feels over reals" and the opposite. Your assumptions, beliefs, or axioms - no matter how fondly held - will be crushed under the infinite weight of reality.