I personally KINDA ditched the "tune by temp" method. The desired effect is a crisp powerband throughout the movement from idle to top end.
From an idle, you should be able to jam on the gas and the car accelerate just as hard as you pulled the trigger with no bog or lag between idle and initial movement.
From movement to top end, you want it to be as linear as possible, gas and exponential powerbands don't always go well together.
Top end should be just that, maximum speed. But, you should be able to hear if your top end is running rich or too lean. If at top end, you don't see ANY smoke, then you're too lean, and if your car feels like it's dragging a tree behind it, you'll know by the sound.
I like to tune by sound and feel. If it's crisp then it's good. But once I'm close and am happy with the feel, then I'll check the temp to see what's up. Also, a few 20 degrees over 220 really isn't going to kill your engine! You'll be fine to push it past 220.
TQ Racing Wire