Thanks to everyone for their thoughts. I've got a LMT Enhanced Carrier inbound. I'll start there and see if that makes any significant difference. I'm looking into Slash's buffers as well.
"When the phone rang, Parker was in the garage, killing a man."
Just make sure the buffer construction is weights which can shift back and forth instead of heavy powder...
The adjustable gas block is something I'm starting to research. Considering how well the rifle has run for me in the past, I'd like to start with modifications that aren't permanent, but it is certainly on the table.
"When the phone rang, Parker was in the garage, killing a man."
Tried the LMT Enhanced Carrier at the range today, paired with the H3 buffer and Red Sprinco spring. In this configuration, I seem to have traded bolt over base malfunctions for consistent failures to lock back on an empty magazine. Seems like progress...research continues.
"When the phone rang, Parker was in the garage, killing a man."
I have a Noveske three way gas block on my 10.5.
Regular/supressed/off
No problems with anything I have run through it yet. Amazing how much quieter it is when you turn it to no gas. Single shot, but no bolt/spring noise.