Recurring Exhaust Leaks After Bolt-Ons

Los Donuts

Update: got another CEL today, it was throwing another P2098 (which is a rear o2 sensor reading my A/F ratio as too lean). Usually that is indicative of a downpipe leak. But since I already got all those leaks sealed and replaced my sensors, I suspect that my tune is running just a little too lean especially for the volatile weather conditions of NY. So I'm going to go to my guy when the weather gets a little warmer and ask him to add more fuel to the ratio. Honestly I don't mind if I lose a bit of hp over it, my engine's well-being and my sanity of not having to stare at that CEL every two weeks is more important to me. Any ideas of what else it may be? Or do I seem to have a pretty spot-on diagnosis?

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2016 Black Cherry Nissan 370z Touring 7AT
Stillen G3 CAI | Armytrix Valvetronic Exhaust | Motordyne ART Pipes | GReddy KW Performance Coilovers | UpRev Tuned