Beyond field stripping, as in removing the trigger group to clean it, and beyond that disassembling the trigger group. I wouldn't go that deep if your not a mechanically inclined person with a photographic memory. These are by far the most complicated trigger groups I've come across.
Simply pop out the pins that hold the entire group in the receiver to remove the entire package as a whole. Spray it down with brake cleen. Lightly oil the pivot points with a light weight oil and re-install the group.
Maybe the firing pin channel is dirty also. While the trigger group is out rack the slide to the rear and lift the bolt and shuttle out. Brake cleen it while depressing the pin repeatedly and reassemble. Do not get oil in the firing pin channel. Getting the bolt and shuttle lined back up with the guide bars can be a bit of a pita.
Too much oil, too thick if oil, and oil in the wrong places is just as bad as filthy dirty.
I use multiple types of oil/grease, specifically for it's particular purpose for each part in each gun. There's no such thing as 1 lube for all jobs.
Or send it back. Or take it to a smith.