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From what I've seen on this forum, if you maintain your current levels, you shouldn't have to shock. Shocking would be if your FC& CC levels start changing on their own, meaning there is something eating up your FC. According to the Best Guess Chart, you are looking good.
Your numbers look great!
How often to test? Every evening.
When to shock? Only if you start seeing algae, have cloudy water, start having an increased chlorine demand, if you detect a CC reading greater than 0.5ppm or if your chlorine level drops below the minimum level needed for your CYA level.