Generally when you’re using Instruments you have to understand there will often be one-time leaks in the system when launching.
You never care about a one-time leak of, like, 438 bytes. You only care about leaks that are continuous.
To find those, you launch your app under Instruments as normal, but then you snapshot it in Instruments once you’ve gotten everything stable (like, do a full drag and drop once, THEN snapshot).
Then you drag and drop some more after the snapshot, and see if there are leaks THEN. Those are the only ones that matter. (Unless, like, you’re somehow leaking like 500MB at launch, which you are not.)