This got me thinking about the shapes of these feed ramps. Looks like the M&P 10 has 5 squared off ramps and 3 angled ramps.
I went over to my office and got my small camera (think teeth...)
and tried to get some images of the barrel and feed ramps.
Not that easy. Here's one that shows them fairly well. These are the flat or squared off ones, not as likely to ding up a case it seems...


Then these bottom three are far sharper and seem likely to be the problem...

Each of these sharper ramps are sharp, perhaps some careful smoothing of the edges would make the difference...