Style chooser

Having a few headaches here with my ride:

Idling problem
After cleaning TB
A/C On - Idling at around 1000 rpm
A/C Off - Idling between 800~900 rpm

A month or more after cleaning TB
A/C On - Idling at around 800~900 rpm (rpm goes up to 1000 when stuck in traffic crawl)
A/C Off - Idling between 500~600 rpm (rpm goes up to 700~800 when stuck in traffic crawl)

Mechanic advised against cleaning TB too often as it might damage it, in my case I have to clean it almost monthly...