Been having an issue with the thermostat. While driving at cruise it will steadily increase until I don’t feel comfortable and will downshift and lift. During deceleration it will plummet 10-15 degrees, then as I resume it will slowly increase again. It’s the 160 thermostat, I’ve done probably 20 drive cycles to remove air over the last 2 weeks. Lower hose does not get as hot as the upper, warm though not hot. I can hold the lower and squeeze the upper and feel flow. I just replaced the thermostat now and it seems better, but still increases temperature in cruise. I think it should be way under where it is in the picture. I have pressure tested the system and it holds 21psi and didn’t drop over 30 minutes. I did test in a pan of boiling water and the new thermostat opens. Also if I’m idling and do a couple quick revs it will drop 10 degrees as well. Am I crazy?