temperture reading difference

[geezer#99]

Leave the carb for now!
You gotta get your idle down. You're likely getting the mechanical timing starting to kick in.
Bump your timing up to 16 to 18. THen turn your idle down. You want it around 700 to 750 max.
That should make it idle leaner.
Or try this.
You want to cover the idle transfer slot up.
You might need to increase your idle with the secondary throttle screw in order to get your primary closed more.