That sounds about right (though I prefer more than 6" of distance), I would not change the spring or adjust extractor.
We eliminated the magazine issue.
We know it is not a lube issue.
We know it is not a cleaning issue.
Ammo? That would be a slim chance, but still a possibility.
Weak hold? Could be an issue.
I would take pictures of the next malfunction. Have someone take of picture of your hold, also. Then coordinate with Para-USA.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)