So, I began googling this issue. Apparently, it's pretty common.
I came up with this video:
https://www.youtube.com/watch?v=jevZBNUbg1o
So, I went to look at the feed ramps in my Noveske (lots of FTF), and my Daniel Defense (Never an FTF.)
...
I believe this to be the issue. Depending on how bad the teeth dig in, is how bad the rifle functions. The more violent the action cycles, the harder that round hits those teeth, the more they dig. This explains why with the H buffer I had less issues than the H2 buffer. It explains why the jam is erratic. It fits.
That said, I am still confident that Cold will make good on his offer to do his best to get my lower fixed so that it's in-spec, if indeed it is out of spec as Daniel Defense reported to me. Also, I am sure that if this barrel extension is the issue, something will be done about it. If it's not too much to hope for, the 8MOA POI shift will also be addressed which causes me to have to nearly bottom out the FSP to zero irons with the can on. Just updating the thread with what I had found so far.
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