Spreading the cover around the lake "may" be a negative, as it may also spread the fish. If the existing pile starts degrading, adding the PVC might be a long term solution to "freshening up" the pile now & again.
Running a line of cover items from shallow to deep, and still on the "private" side and within reach of your bank fishing casts, might be an option. It would serve as a potential spawning spot, as well as give some cover items at different depths. May not be worth the effort, though, if the water is very clear all the time ... as the fish may not use it, other anglers can easily see it, etc.
You might want to wait until some of our "pond management" guys chime in, as I'm no expert & just making guesses & assumptions.
... cp