Presently I am running a 160 deg F with no codes.
Bad practice. Many of the emissions calibrations are set to change loop types at or near 160 degrees coolant temperature. Also, engine efficiency suffers a bit. (Your engine has a perfectly good high flow CAI, so that's not an issue with coolant temps.)
The proper thermostat is set to begin opening at 188 and be fully open at 206. The engine will run art from 192 to 200 degrees or so winter and summer, highway or traffic - so the thermostat is almost never fully open, except when in heavy traffic, no A/C function set, and the coolant warms to 224, fans go to SLOW and it cools to 213, fans turn OFF, cycle repeats until you get moving again.
Please study the several sticky posts on this in the main Engines; Northstar page and also study the entire Cadillac Technical Archive way up ^^^ in the top black bar - it was written by one of the GM Northstar System engineers.
Whether the car has this 180 degree sweep gauge or the earlier 135 degree sweep, the temperature indication marks are the same.
It is perfectly normal for any of these engines to warm into the green dot area in traffic.