You're up against at least two factors, if not three, all of which stem from PSA sucking at design and going for cost savings in manufacturing. Your recoil buffer and spring are the known bad factors, the only question remaining is whether or not your buffer tube will work with the correct buffer and spring. Once we have the internal depth of your buffer tube, we can tell you whether or not you need to replace all three items, or just two. This is why we want measurements with pictures.
Explaining the physics isn't productive when a buffer tube that's too short will never allow adequate function to begin with....