Well Jeff, priorities and expectations.
Usually when I'm particular on the thinner material I'd drop the amps down to about 35ish and run the speed a little lower. the 14ga material we cut does have a little dross accumulation in the corners but nothing a zip of the wire wheel wouldn't take off.
If you are using a FC80, with the regular 40 amp consumables you should be running around 245ish on your 16ga @ 40amps.
I only use the book values for the Cut Height, Pierce Height, and Pierce Delay and use the OPTIMAL FEED RATE as a starting point for the line speed test. After I run the line speed test, I'll run a small part to verify the output at the speed I found looked good. The straight lines will usually cut but the corners and inside features will run slower so I will accommodate for that. I'll usually run a 4" baseplate from the shape library to get my speeds dialed in.
On that thin of material the CUT HEIGHT shouldn't move a whole lot as if you are getting any bevel on your cuts then its mechanics (torch square to the material) or consumables (worn nozzle).