The data demonstrate that periodic removal, cleaning and refitting of injectors creates more defects than it solves. If that's too traumatic for you to accept, Perspective, that's your problem.
You refer to an important difference, ED, that used to have me worried (until I studied the system and the data): NA injectors as compared with TN/TC injectors.
When the engine is running the NA injectors are sucking in air through the fine screen at the bottom of the airshroud. I used to worry that the fine screen would eventually get clogged if there were any impurities/particles/dust in the air inside the cowling. But then I saw what the fuel in the injector lines does when the diaphragm in the manifold closes on shut down...