Yes, as they get beat up the leading edge of the disc drops lower, which reduces the stability. You may notice that some of your discs finish with a harder fade when new, and maybe not much at all after getting broken in. There's really nothing wrong with that in theory, because a beat-in disc is a very useful tool in your bag, but it does reduce predictability to a degree...and the degree at which DX plastic drivers break in isn't favorable.
With your mids, do you have one you trust to fly straight from a flat throw, meaning not much turn and not much fade? If so, keep that, and add a DX Roc for headwinds and when you need more fade. Eventually that can become your bread and butter...beat Rocs are fantastic. Oh and DX Rocs tend to be much better than other molds in DX, especially drivers.
Hope this helps!